Add CI for the data feeds contracts workspace

[Fletch153]

Summary

• Give the data feeds contracts (a separate cargo workspace under contracts/data-feeds) their own CI: tests, clippy, formatting, and a wasm build, without touching how the CCIP workspace is built or tested.
• Extend the generated-code check so contract changes cannot merge with stale or missing Go bindings.

Context

The data feeds contracts live in their own cargo workspace pinned to a newer rust and soroban-sdk than the root workspace, so none of the existing contract workflows compiled them. This adds coverage for that workspace while keeping the two projects independent: data feeds jobs only trigger on changes that affect them, and other projects' PRs are unaffected.

Changes

• Data feeds workflow: new data-feeds-contracts.yaml with test, lint plus format, and wasm build jobs running inside contracts/data-feeds. Path filtered to the workspace, the workflow itself, and the composite actions the jobs execute, so a broken action edit fails here instead of on the next unrelated data feeds PR. Runs unfiltered in merge groups, matching the other workflows.
• Rust toolchain action: setup-rust-toolchain now takes toolchain and clippy inputs (defaults unchanged, existing callers behave identically). The rustup target and component installs are scoped to the requested toolchain instead of whatever is currently default, which matters now that one job can install two toolchains.
• Formatting workflow: check-formatting additionally installs the data feeds toolchain with rustfmt, since the repo-wide format check now recurses into the data feeds workspace and each toolchain needs its own rustfmt.
• Generated-code check: check-generated marks untracked files with git add --intent-to-add before diffing. Previously a brand-new contract whose generated bindings were never committed would pass, because git diff ignores untracked files.
• Justfiles: new contracts/data-feeds/Justfile owns the workspace's recipes; the root Justfile mounts it as a module and delegates, so root recipes stay generic. Root also gains lint-contracts and runs it in the all pipeline.

Testing

• just check-contracts, just fmt-contracts-check, and just lint-contracts run clean locally across both workspaces.
• Verified the existing bindings generation scripts already build and cover the data feeds contracts, so the generated-code check exercises them on every PR.

Notes

• Stacked on Add data feeds cache and proxy bindings #162, which stacks on Add data feeds cache, proxy, and common contracts #161. Merge those first; this PR retargets automatically as they land.

[github-actions]

Soroban Contract Test Coverage

92.57% line coverage — 18067 / 19517 lines hit

Metric	Hit	Total	Coverage
Lines	18067	19517	92.57%
Functions	1196	1538	77.76%
Regions	33594	35986	93.35%

Per-Contract Breakdown

Contract	Lines (Hit / Total)	Line Cov	Funcs (Hit / Total)	Func Cov
other	18067 / 19517	92.6%	1196 / 1538	77.8%

Full file-level coverage report

Filename                                                 Regions    Missed Regions     Cover   Functions  Missed Functions  Executed       Lines      Missed Lines     Cover    Branches   Missed Branches     Cover
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
ccip-ramp-registry/src/lib.rs                                188                75    60.11%           8                 3    62.50%         104                41    60.58%           0                 0         -
ccip-ramp-registry/src/test.rs                               214                 0   100.00%           5                 0   100.00%         128                 0   100.00%           0                 0         -
ccip-ramp-registry/src/types.rs                               83                11    86.75%          17                 6    64.71%          83                11    86.75%           0                 0         -
ccvs/committee-verifier/src/lib.rs                           588                54    90.82%          26                 2    92.31%         382                10    97.38%           0                 0         -
ccvs/committee-verifier/src/test.rs                         1300                25    98.08%          48                 2    95.83%         587                13    97.79%           0                 0         -
ccvs/committee-verifier/src/types.rs                          17                 8    52.94%           6                 5    16.67%          14                 7    50.00%           0                 0         -
ccvs/versioned-verifier-resolver/src/lib.rs                  287                21    92.68%          14                 1    92.86%         162                 4    97.53%           0                 0         -
ccvs/versioned-verifier-resolver/src/test.rs                 680                 9    98.68%          20                 0   100.00%         359                 3    99.16%           0                 0         -
ccvs/versioned-verifier-resolver/src/types.rs                 89                 6    93.26%          16                 4    75.00%          83                 4    95.18%           0                 0         -
common/authorization/src/allowlist.rs                        167                51    69.46%          12                 4    66.67%         110                40    63.64%           0                 0         -
common/authorization/src/lib.rs                              426                27    93.66%          16                 0   100.00%         277                16    94.22%           0                 0         -
common/authorization/src/ownable.rs                          102                13    87.25%           9                 1    88.89%          62                 6    90.32%           0                 0         -
common/authorization/src/test.rs                            1195                 0   100.00%          57                 0   100.00%         462                 0   100.00%           0                 0         -
common/guard/src/initializable.rs                             30                 1    96.67%           4                 0   100.00%          22                 1    95.45%           0                 0         -
common/guard/src/lib.rs                                       32                 1    96.88%           4                 0   100.00%          22                 0   100.00%           0                 0         -
common/guard/src/test.rs                                     101                 0   100.00%           8                 0   100.00%          47                 0   100.00%           0                 0         -
common/helpers/src/curse_checkable.rs                        103                24    76.70%           6                 1    83.33%          56                12    78.57%           0                 0         -
common/helpers/src/map_updater.rs                             94                15    84.04%           7                 3    57.14%          39                 8    79.49%           0                 0         -
common/helpers/src/soroban_invoke.rs                         277                 7    97.47%          12                 0   100.00%         115                 1    99.13%           0                 0         -
common/interfaces/src/ccip_receiver.rs                         8                 8     0.00%           8                 8     0.00%           8                 8     0.00%           0                 0         -
common/interfaces/src/committee_verifier.rs                   13                13     0.00%          13                13     0.00%          13                13     0.00%           0                 0         -
common/interfaces/src/fee_quoter.rs                           17                17     0.00%          17                17     0.00%          17                17     0.00%           0                 0         -
common/interfaces/src/offramp.rs                              11                11     0.00%          11                11     0.00%          11                11     0.00%           0                 0         -
common/interfaces/src/onramp.rs                                9                 9     0.00%           9                 9     0.00%           9                 9     0.00%           0                 0         -
common/interfaces/src/ramp_registry.rs                         5                 5     0.00%           5                 5     0.00%           5                 5     0.00%           0                 0         -
common/interfaces/src/rmn_proxy.rs                             6                 6     0.00%           6                 6     0.00%           6                 6     0.00%           0                 0         -
common/interfaces/src/router.rs                                9                 9     0.00%           9                 9     0.00%           9                 9     0.00%           0                 0         -
common/interfaces/src/siloed_lock_release_pool.rs             21                21     0.00%          21                21     0.00%          21                21     0.00%           0                 0         -
common/interfaces/src/token_admin_registry.rs                  8                 8     0.00%           8                 8     0.00%           8                 8     0.00%           0                 0         -
common/interfaces/src/token_lock_box.rs                        6                 6     0.00%           6                 6     0.00%           6                 6     0.00%           0                 0         -
common/interfaces/src/token_pool.rs                           11                11     0.00%          11                11     0.00%          11                11     0.00%           0                 0         -
common/interfaces/src/versioned_verifier_resolver.rs          10                10     0.00%          10                10     0.00%          10                10     0.00%           0                 0         -
common/message/src/lib.rs                                    586                41    93.00%          28                 4    85.71%         298                 9    96.98%           0                 0         -
common/message/src/test.rs                                   641                 2    99.69%          28                 0   100.00%         323                 0   100.00%           0                 0         -
common/pool/src/decimals.rs                                  109                10    90.83%           6                 0   100.00%          76                 3    96.05%           0                 0         -
common/pool/src/finality_codec.rs                             52                 1    98.08%           3                 0   100.00%          41                 0   100.00%           0                 0         -
common/pool/src/lib.rs                                       460                31    93.26%          32                 1    96.88%         409                26    93.64%           0                 0         -
common/pool/src/rate_limit.rs                                180                 7    96.11%           9                 0   100.00%         145                 3    97.93%           0                 0         -
common/pool/src/types.rs                                      20                14    30.00%          16                14    12.50%          30                14    53.33%           0                 0         -
common/signature/src/config.rs                                44                12    72.73%           6                 2    66.67%          28                 5    82.14%           0                 0         -
common/signature/src/quorum.rs                                68                 1    98.53%           2                 0   100.00%          44                 1    97.73%           0                 0         -
common/signature/src/scheme.rs                                45                 0   100.00%           2                 0   100.00%          29                 0   100.00%           0                 0         -
cre/forwarder/src/error.rs                                     8                 3    62.50%           1                 0   100.00%           8                 3    62.50%           0                 0         -
cre/forwarder/src/lib.rs                                     462                24    94.81%          18                 0   100.00%         318                 7    97.80%           0                 0         -
cre/forwarder/src/test.rs                                   2886                14    99.51%         128                 2    98.44%        1204                 8    99.34%           0                 0         -
cre/forwarder/src/types.rs                                    62                 6    90.32%          10                 6    40.00%          36                 6    83.33%           0                 0         -
cre/test/read_fixture/src/lib.rs                             125               125     0.00%          33                33     0.00%         103               103     0.00%           0                 0         -
cre/test/receiver/src/lib.rs                                  53                53     0.00%           5                 5     0.00%          26                26     0.00%           0                 0         -
cre/test/rejecting_receiver/src/lib.rs                         3                 3     0.00%           1                 1     0.00%           8                 8     0.00%           0                 0         -
fee-quoter/src/lib.rs                                        771               164    78.73%          20                 3    85.00%         527               100    81.02%           0                 0         -
fee-quoter/src/test.rs                                       861                 0   100.00%          17                 0   100.00%         427                 0   100.00%           0                 0         -
fee-quoter/src/types.rs                                       13                13     0.00%          13                13     0.00%          13                13     0.00%           0                 0         -
mcms/src/abi_encoding.rs                                     216                 4    98.15%          10                 0   100.00%          98                 1    98.98%           0                 0         -
mcms/src/constants.rs                                         10                 0   100.00%           2                 0   100.00%           6                 0   100.00%           0                 0         -
mcms/src/crypto.rs                                           202                 3    98.51%           7                 0   100.00%         109                 2    98.17%           0                 0         -
mcms/src/error.rs                                              8                 4    50.00%           1                 0   100.00%           8                 4    50.00%           0                 0         -
mcms/src/lib.rs                                              713                50    92.99%          20                 0   100.00%         483                23    95.24%           0                 0         -
mcms/src/test.rs                                            2278                19    99.17%          59                 0   100.00%        1095                 2    99.82%           0                 0         -
mcms/src/types.rs                                             10                10     0.00%          10                10     0.00%          10                10     0.00%           0                 0         -
offramp/src/lib.rs                                           729               400    45.13%          23                 8    65.22%         473               224    52.64%           0                 0         -
offramp/src/test.rs                                          890                 0   100.00%          28                 0   100.00%         363                 0   100.00%           0                 0         -
offramp/src/types.rs                                          21                 9    57.14%           6                 5    16.67%          17                 7    58.82%           0                 0         -
onramp/src/lib.rs                                           1181               149    87.38%          27                 2    92.59%         739                61    91.75%           0                 0         -
onramp/src/test.rs                                          1591                 4    99.75%          37                 0   100.00%         708                 4    99.44%           0                 0         -
onramp/src/types.rs                                           23                 9    60.87%           6                 5    16.67%          19                 7    63.16%           0                 0         -
pools/burn-mint-pool/src/lib.rs                              390               107    72.56%          28                 9    67.86%         282                55    80.50%           0                 0         -
pools/burn-mint-pool/src/test.rs                            2671                24    99.10%          56                 5    91.07%        1744                55    96.85%           0                 0         -
pools/lock-release-pool/src/lib.rs                           404               100    75.25%          28                 8    71.43%         288                48    83.33%           0                 0         -
pools/lock-release-pool/src/test.rs                         2330                24    98.97%          55                 5    90.91%        1524                55    96.39%           0                 0         -
pools/siloed-lock-release-pool/src/lib.rs                    556               196    64.75%          38                17    55.26%         384               123    67.97%           0                 0         -
pools/siloed-lock-release-pool/src/test.rs                  1303                12    99.08%          38                 2    94.74%         695                18    97.41%           0                 0         -
pools/token-lock-box/src/lib.rs                              197                17    91.37%          13                 1    92.31%         113                 2    98.23%           0                 0         -
pools/token-lock-box/src/test.rs                             257                 0   100.00%           7                 0   100.00%          73                 0   100.00%           0                 0         -
registry/src/lib.rs                                            8                 0   100.00%           1                 0   100.00%           3                 0   100.00%           0                 0         -
registry/src/test.rs                                          27                 0   100.00%           1                 0   100.00%          11                 0   100.00%           0                 0         -
rmn_proxy/src/lib.rs                                          66                12    81.82%           5                 1    80.00%          34                 3    91.18%           0                 0         -
rmn_proxy/src/test.rs                                        279                 0   100.00%          11                 0   100.00%          91                 0   100.00%           0                 0         -
rmn_remote/src/lib.rs                                        302                26    91.39%          16                 1    93.75%         171                10    94.15%           0                 0         -
rmn_remote/src/test.rs                                       393                 0   100.00%          14                 0   100.00%         133                 0   100.00%           0                 0         -
router/src/lib.rs                                            593                87    85.33%          18                 1    94.44%         374                43    88.50%           0                 0         -
router/src/test.rs                                          1186                 0   100.00%          29                 0   100.00%         497                 0   100.00%           0                 0         -
router/src/test_panic_receiver.rs                              5                 0   100.00%           2                 0   100.00%           5                 0   100.00%           0                 0         -
router/src/types.rs                                            3                 3     0.00%           3                 3     0.00%           3                 3     0.00%           0                 0         -
timelock/src/error.rs                                          6                 2    66.67%           1                 0   100.00%           6                 2    66.67%           0                 0         -
timelock/src/lib.rs                                          649                46    92.91%          32                 2    93.75%         393                18    95.42%           0                 0         -
timelock/src/roles.rs                                        141                10    92.91%           6                 0   100.00%          76                 7    90.79%           0                 0         -
timelock/src/storage.rs                                      115                15    86.96%          12                 1    91.67%          68                 7    89.71%           0                 0         -
timelock/src/test.rs                                        1479                16    98.92%          37                 0   100.00%         531                 1    99.81%           0                 0         -
timelock/src/types.rs                                          3                 3     0.00%           3                 3     0.00%           3                 3     0.00%           0                 0         -
token-admin-registry/src/lib.rs                              368                23    93.75%          18                 1    94.44%         257                 4    98.44%           0                 0         -
token-admin-registry/src/test.rs                             825                 0   100.00%          21                 0   100.00%         287                 0   100.00%           0                 0         -
token-admin-registry/src/types.rs                              2                 2     0.00%           2                 2     0.00%           2                 2     0.00%           0                 0         -
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
TOTAL                                                      35986              2392    93.35%        1538               342    77.76%       19517              1450    92.57%           0                 0         -```

</details>

> Commit `573409e1` | [Full CI run](https://github.com/smartcontractkit/chainlink-stellar/actions/runs/31440298332)

<!-- Sticky Pull Request Commentcontract-coverage -->