Add cloud mount client and factory writeback guard

[kjgbot]

Summary

• Add RelayfileCloudMountClient for direct cloud relayfile access to workspace rw_7ccfea89, with config-driven workspace/credentials and fake-client unit coverage.
• Add default-on Linear writeback safety for setState, postComment, and createIssue.
• Guard semantics: unwrap payload, allow only titles exactly [factory-e2e] or starting [factory-e2e] ; allow absent team; refuse present non-AR team; fail closed on unreadable/missing title.
• Harden Linear parsing for sparse real sync shapes with missing labels, missing stateId, and state_name fallback.

Verification

• npx vitest run packages/factory-sdk
• npx tsc --noEmit -p tsconfig.node.json

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: fa1fefc6-3d05-4f55-95ce-2e521ea8b0f8

📥 Commits

Reviewing files that changed from the base of the PR and between 3c8fe63 and 53eb366.

📒 Files selected for processing (12)

• packages/factory-sdk/src/config/schema.test.ts
• packages/factory-sdk/src/config/schema.ts
• packages/factory-sdk/src/index.ts
• packages/factory-sdk/src/mount/relayfile-cloud-mount-client.test.ts
• packages/factory-sdk/src/mount/relayfile-cloud-mount-client.ts
• packages/factory-sdk/src/orchestrator/factory.test.ts
• packages/factory-sdk/src/orchestrator/factory.ts
• packages/factory-sdk/src/ports/writeback.ts
• packages/factory-sdk/src/testing/fakes.ts
• packages/factory-sdk/src/writeback/index.ts
• packages/factory-sdk/src/writeback/linear.ts
• packages/factory-sdk/src/writeback/writeback.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch factory-sdk/w8-cloud-mount

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[agent-relay-code]

Implemented a real fix in the PR scope: MountLinearWriteback.setState now preserves the existing Linear issue wrapper/payload and updates only payload.stateId before writing to Relayfile. This avoids clobbering cloud-mounted Linear issue records. The fake mount now uses replacement semantics so tests no longer hide partial-write bugs.

Changed:

• packages/factory-sdk/src/writeback/linear.ts
• packages/factory-sdk/src/testing/fakes.ts
• packages/factory-sdk/src/writeback/writeback.test.ts
• packages/factory-sdk/src/orchestrator/factory.test.ts

Addressed comments

• gemini-code-assist[bot]: quota-limit warning only; no actionable code finding.
• coderabbitai[bot]: review-rate-limit/usage warning only; no actionable code finding.

Advisory Notes

• GitHub connector status for head 53eb366 only exposed CodeRabbit: success; it did not expose full Actions/mergeability state, so I am not printing READY.

Local checks run:

• npm ci
• npm run verify:mcp-resources-drift
• npm run lint (warnings only)
• npm run typecheck:web
• npm run typecheck:node
• npm test
• npx vitest run
• npm run build
• npm run build:web
• npx playwright install chromium
• npx playwright test --config playwright.fidelity.config.ts
• npx playwright test --config playwright.redraw.config.ts