docs: add compiler-smoke-e2e and __tests__ to ado-script architecture tree

AGENTS.md

@@ -268,8 +268,10 @@ fail-closed and only pauses when the agent actually proposed a reviewed output.
 │           ├── approval-summary/ # Safe-outputs summary renderer (bundled to approval-summary.js; end-of-Agent-job summary tab)
 │           ├── github-app-token/ # GitHub App token minter (bundled to github-app-token.js; mints installation token in Agent + Detection when engine.github-app-token is set)
 │           ├── executor-e2e/ # Stage 3 safe-output E2E test harness (not a bundle; runs deterministic scenarios against a real ADO project and files a GitHub issue on failure)
+│           ├── compiler-smoke-e2e/ # Compiler smoke E2E orchestrator (not a bundle; stages candidate compiler as a supply-chain.pipeline-artifact, pushes to a mirror branch, queues the five fixed fixture pipelines, and asserts green; referenced by `tests/compiler-smoke-e2e/`)
 │           ├── prepare-pr-base/ # create-pull-request preparer (bundled to prepare-pr-base.js): Agent mode uses ADO diff metadata + bounded dual-ref fallback to make the merge-base reachable; SafeOutputs mode fetches only the target worktree tip
 │           ├── trigger-e2e/ # Test-only gate-spec / trigger-evaluation harness (not a bundle): mirrors Rust `Fact::ALL` in `gate-spec.ts`; `fact-catalog.gen.json` is generated by `export-fact-catalog` and drift-guarded by CI
+│           ├── __tests__/   # Bundle-coverage test (not a bundle; `bundle-coverage.test.ts` guards that every `src/` subdirectory is either listed in `NON_BUNDLE_DIRS` or ships a compiled bundle)
 │           └── shared/   # Shared modules across bundles (auth, ado-client, env-facts, types.gen.ts)
 ├── tests/                # Integration tests and fixtures
 ├── docs/                 # Per-concept reference documentation (see index below)

docs/ado-script.md

@@ -112,6 +112,16 @@ pipeline** as runtime helpers. Today it produces thirteen bundles:
 > so the `gate-spec.test.ts` test can deep-compare `FACT_META` against the
 > Rust-side `Fact::ALL` registry, catching drift at CI time.
 
+> **Test-only, not shipped: `compiler-smoke-e2e`.** The workspace also contains a
+> `src/compiler-smoke-e2e/` orchestrator (not a bundle) that stages the compiler
+> candidate produced by the current build (PR or nightly `main`) as a
+> `supply-chain.pipeline-artifact`, pushes it to a short-lived mirror branch,
+> queues the five fixed fixture pipelines listed in
+> [`tests/compiler-smoke-e2e/REGISTERED.md`](../tests/compiler-smoke-e2e/REGISTERED.md),
+> and asserts they all go green. It is listed in `NON_BUNDLE_DIRS` in
+> `src/__tests__/bundle-coverage.test.ts` and the compiler never references it
+> directly.
+
 ## What `gate.js` does
 
 `gate.js` is a single-shot Node program that runs as a step in the
@@ -564,7 +574,9 @@ scripts/ado-script/
 │   │   ├── gate-spec.ts         # FACT_META mirror of Rust Fact::ALL; drift-guarded by export-fact-catalog + fact-catalog.gen.json
 │   │   ├── fact-catalog.gen.json # generated by `cargo run -- export-fact-catalog`; deep-compared by gate-spec.test.ts
 │   │   └── __tests__/           # gate-spec drift tests and trigger-evaluation scenario tests
-│   └── executor-e2e/            # test-only: Stage 3 safe-output E2E harness (not a bundle; built to test-bin/executor-e2e.js)
+│   ├── executor-e2e/            # test-only: Stage 3 safe-output E2E harness (not a bundle; built to test-bin/executor-e2e.js)
+│   ├── compiler-smoke-e2e/      # test-only: compiler candidate smoke orchestrator (not a bundle); stages candidate as supply-chain.pipeline-artifact, queues five fixture pipelines on mirror branch, asserts green
+│   └── __tests__/               # bundle-coverage guard: `bundle-coverage.test.ts` asserts every src/ subdir is either in NON_BUNDLE_DIRS or ships a compiled bundle
 ├── test/                        # End-to-end smoke tests (gate, import, exec-context-pr)
 ├── gate.js                      # ncc bundle output (gitignored)
 ├── import.js                    # ncc bundle output (gitignored)