feat: sync and release MiniMax Code 0.6.0

[hetaoBackend]

Change

Port the reviewed 0.6.0 runtime and TUI behavior into the standalone distribution and bump the root and TUI source versions to 0.6.0.

• TUI: /retry now works inside a /btw side conversation and resends the side conversation's last message, instead of reporting that the command is unavailable in side conversations. docs/tui-capabilities.md documents it.
• Default model: when no model has been selected, the official default is now MiniMax-M3.1-Flash-Preview, which is already in the built-in fallback catalog.
• Goal completion: an accepted update_goal complete proposal no longer ends the Turn. The result carries an instruction to write one final reply to the user covering what was done, where the deliverables are and how to use them. A local-runtime-v2 tool guard and extension refuse further tool calls in that Turn and retry one empty reply. blocked proposals still end the Turn. Goal prompts are updated to match.
• Provider refusals: a model safety refusal (stop_reason: refusal) is classified as content_filter and is not retried, including on BYOK, where other pre-output failures are retried. The vendored Anthropic provider keeps the refusal category and explanation in the error message instead of An unknown error occurred. This is recorded in third_party/pi-mono/MINIMAX_CHANGES.md.
• Network retry: ERR_SSL_BAD_RECORD_MAC_ALERT / net::ERR_SSL_BAD_RECORD_MAC_ALERT before any output is retried like other transient network failures. Arbitrary TLS/certificate errors are still not retried, and nothing is retried after visible output.
• Continuation compaction: when compaction has already produced a durable replacement and a background reminder asks for before-current-user placement in a continuation (which has no current user message), the reminder is appended at the tail. Previously the provider call was aborted, and every retry recompacted the same history.

Already present on main and not changed here: hidden-thinking TPS timing (#413) and regular-mode history stability during live runs (#416).

Not applicable to this distribution: the private session capture fix and Desktop-only presentation changes from the same release.

PR labels: enhancement, bug, cli, tui.

Validation

• MCODE_VERIFY_REPORT_DIR=<outside repo> pnpm verify (full profile, macOS arm64) on the PR head (97124bd) with a clean tracked tree: passed 15 gates on darwin. Skipped: test:windows (not applicable on macOS) and test:release-package (requires an npm release archive). An earlier run failed test:byok because it still expected the old default model; the fix is included.
• Focused Vitest while porting:
  • agent-core llm-retry (TLS recovery from throw and stream, no retry after output, refusal terminal on managed and BYOK providers)
  • executor continuation-compaction regression
  • side-conversation /retry app test
  • goal module, final-reply and local-runtime goal host-integration tests (16 files, 367 tests)
  • model-selection and config fallback tests
• pnpm typecheck, pnpm lint:tui, node scripts/source-inventory.mjs --write (4 new source/test files reviewed and recorded; new tests declared in test/vitest-suites.json).
• Performance: basic. No session-history storage, streaming throughput or tool-loop hot path is changed.
• NOT RUN: Windows and Linux (left to CI), real Claude refusal or TLS fault injection against live services, and real-model Goal final-reply behavior. All provider and model behavior above is covered by offline fixtures only.

Publication and contribution checks

• I have permission to contribute these changes under the existing licenses applicable to the changed files/packages; imported material and its provenance are identified and existing notices are preserved.
• No credentials, account data, real user content, internal source history or private review material is included.
• Added/removed source files were reviewed before regenerating release/public-source.json; new tests are declared in test/vitest-suites.json where applicable.
• Shared English/Chinese documentation and capability/verification records are updated where applicable. Mock/offline results are not described as live-service acceptance.

Maintainer handoff

Publication scope or license changes (if any): none. Four new source/test files are added to the inventory. release/extraction.json sourceRevision is intentionally unchanged: this is a selective release update, not a full baseline review.

Shared-source port: complete for the behaviors listed above.

Release: following the 0.5.10 flow, tag v0.6.0 on the version commit to trigger the CLI release workflow. No tag has been created by this PR.

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