fix: code workspace path escape errors

[xianjianlf2]

Related Issue

No linked issue.

Problem

Path escapes from the workspace root currently bubble as generic errors instead of a stable workspace-specific code, which makes terminal reporting inconsistent.

What changed

Added a coded workspace-path-escape error, throw it from the workspace context service, map it to FS_PATH_ESCAPES_SESSION in kap-server, and cover the path with tests. Added a changeset for the release note.

Checklist

• I have read the CONTRIBUTING document.
• I have linked a related issue, or explained the problem above.
• I have added tests that prove my feature works.
• Ran gen-changesets skill, or this PR needs no changeset.
• Ran gen-docs skill, or this PR needs no doc update.

[changeset-bot]

🦋 Changeset detected

Latest commit: bd03d61

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@moonshot-ai/kimi-code	Patch

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[xianjianlf2]

Resolved conflicts with latest main and pushed head 4c4459f. The resolution keeps current main's shared FS_PATH_ESCAPES error domain and maps terminal cwd escapes to FS_PATH_ESCAPES_SESSION. Local validation under Node 24.18.0: pnpm install --frozen-lockfile; pnpm --dir packages/agent-core-v2 test test/session/workspaceContext/workspaceContextService.test.ts (3 passed); pnpm --dir packages/kap-server test test/terminals.test.ts (4 passed).

[xianjianlf2]

Rebased/resolved conflicts against upstream main.

Validation:

• pnpm exec vitest run packages/agent-core-v2/test/session/workspaceContext/workspaceContextService.test.ts packages/kap-server/test/terminals.test.ts (8 passed)
• pnpm exec oxlint --type-aware packages/agent-core-v2/src/session/workspaceContext/workspaceContextService.ts packages/agent-core-v2/test/session/workspaceContext/workspaceContextService.test.ts packages/kap-server/src/routes/terminals.ts packages/kap-server/test/terminals.test.ts (0 errors; warnings only)
• git diff --check

Current head: bd03d61