feat: rewrite mattermost-cli in Go

[ardasevinc]

what changed

• replaces the TypeScript implementation with a native Go v2 CLI
• makes all remote mutations stage-first and exact-revision apply-only
• preserves the frozen v1 safety and retrieval contracts through differential coverage
• adds durable SQLite staging, crash recovery, retention, and replay semantics
• adds deterministic native archives, npm platform packages, Homebrew formula generation, and OIDC publication
• removes the Bun/Vitest implementation after closing the parity ledger

why

Immediate message mutation was too sharp for humans and agents. Go v2 makes intent inspectable and durable before any real Mattermost effect while retaining the accumulated failure-mode guarantees of v1.

verification

• just gate
• just docker-e2e
• deterministic double-build and checksum verification
• exact five-package npm install smoke
• isolated Homebrew formula install/test
• TypeScript removal ledger covering all 34 frozen test files

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📥 Commits

Reviewing files that changed from the base of the PR and between eccfc50 and 3a004c8.

⛔ Files ignored due to path filters (2)

• bun.lock is excluded by !**/*.lock
• go.sum is excluded by !**/*.sum

📒 Files selected for processing (384)

• .github/workflows/ci.yml
• .github/workflows/publish.yml
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• AGENTS.md
• README.md
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• conformance/README.md
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• conformance/scenarios/v1/whoami.json
• docs/SPEC.md
• docs/V1_PARITY_MATRIX.md
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• go.mod
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• internal/buildinfo/buildinfo.go
• internal/cli/apply.go
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• internal/cli/channel.go
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• internal/cursor/cursor.go
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• internal/doctor/doctor.go
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• internal/mattermost/channels.go
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• internal/mattermost/conversation_mutations.go
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• schemas/v2/thread.schema.json
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• schemas/v2/watch-diagnostic.schema.json
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• skills/mattermost-cli/SKILL.md
• src/api/channels.ts
• src/api/client.ts
• src/api/index.ts
• src/api/posts.ts
• src/api/url.ts
• src/api/users.ts
• src/api/websocket.ts
• src/cli.ts
• src/config.ts
• src/cursor.ts
• src/doctor.ts
• src/formatters/index.ts
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• src/input.ts
• src/preprocessing/credential.ts
• src/preprocessing/index.ts
• src/preprocessing/patterns.ts
• src/preprocessing/pipeline.ts
• src/preprocessing/post.ts
• src/preprocessing/sanitize.ts
• src/preprocessing/secrets.ts
• src/types.ts
• src/utils/colors.ts
• src/utils/date.ts
• src/utils/index.ts
• src/utils/threading.ts
• src/utils/unread.ts
• src/validation.ts
• staticcheck.conf
• tests/api/channels.test.ts
• tests/api/client.test.ts
• tests/api/messages.test.ts
• tests/api/paths.test.ts
• tests/api/posts.test.ts
• tests/api/retrieval.test.ts
• tests/api/url.test.ts
• tests/api/websocket.test.ts
• tests/channels-type-validation.test.ts
• tests/cli-empty-reads.test.ts
• tests/cli-failure-propagation.test.ts
• tests/cli-metadata.test.ts
• tests/cli-output.test.ts
• tests/cli-retrieval.test.ts
• tests/config-doctor.test.ts
• tests/cursor-cli.test.ts
• tests/cursor-commander.test.ts
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• tests/fixtures/markdown.ts
• tests/formatters/headers.test.ts
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• tests/helpers/fake-fetch.ts
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• tests/input.test.ts
• tests/preprocessing/post.test.ts
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• tests/preprocessing/secrets.test.ts
• tests/send-commander.test.ts
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• tests/users.test.ts
• tests/utils/date.test.ts
• tests/utils/threading.test.ts
• tests/utils/unread.test.ts
• tests/validation.test.ts
• tsconfig.json
• vitest.config.ts
• vitest.e2e.config.ts

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