feat(editor): add MoonIDE CodeLens to SeekMoon

[bzy-debug]

Opening a MoonBit source file in SeekMoon now shows Local and Outside reference CodeLens actions above declarations. Clicking an action opens References Peek, with Outside references resolved on demand.

• Add the host-neutral Viewer provider, lazy resolution, rendering, and command forwarding, and connect the desktop Source Viewer through moonide.codelens to moon ide codelens <relative-path> --json.
• Keep CodeLens out of Diff, Original, History, Markdown, and MBTI presentations. Fence stale replies by source identity, model version, and navigation state.
• Validate source paths through LanguagePath; resolve Local targets physically inside the workspace and remap them to the lexical root. Accept only the two reference actions and discard malformed result entries.
• Use explicit desktop JSON codecs, preserve UTF-8 decoding errors in failed CLI output, and cover provider behavior, protocol validation, and browser interactions.

Validation after rebasing onto main (96e6362e)

The two feature commits remain patch-equivalent after the rebase.

• Passed: just build, just editor-test (4,176 tests across supported targets), moon test --target js (3,205 tests), and moon cram test tests/cram (24 cases).
• Passed: moon info && moon fmt with no generated or formatting changes, and git diff --check.
• Passed: just editor-test-browser (106/106, including all three CodeLens scenarios).
• just check is blocked by 10 unused-package warnings in unchanged root packages on stable moonc v0.10.12+1634b282e.
• just test stops after native tests: 3,171 passed and 58 failed in unchanged agent/tool_definition.mbt and agent_tool/mbtx tests. Multiple failures report target directory source exists and is not a directory; JS and cram were run separately and passed.
• The previous PR head's two nightly editor CI jobs failed during dependency resolution because Rabbita 0.15.4 imports moonbitlang/core/strconv. The latest main Editor run also has failing nightly jobs; the workflow marks nightly as continue-on-error. Refreshed CI must be checked separately.

Earlier implementation validation included 24/24 desktop browser tests and packaged macOS Proton/CEF testing of Local/Outside Peek, cross-file previews, stale replies, and absence from diffs. Those desktop checks were not rerun for this patch-equivalent rebase.

CodeLens requires a toolchain with moon ide codelens. Older toolchains use the provider error path and show no lenses.

[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-03T10:42:13.836776Z	08f4961	PR opened

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[chatgpt-codex-connector]

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Reviewed commit: 08f4961b37

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