fix(client): keep Grok tool names across ACP tool_call_update patches

[L42y]

Summary

• Grok ACP tool_call_update is a patch: later completed/failed updates often send only status + rawOutput and omit title / _meta["x.ai/tool"].
• The Grok adapter treated each payload as a full snapshot and labeled the missing name grok:unknown. The Working lane then kept the latest row per toolUseId, so a nameless completion overwrote a good start name.
• Merge last-known GrokToolInfo by toolCallId before emitting session events. Keep grok:unknown only when that id has never had a name or title.

Validation

• biome check on the four changed Grok files
• pnpm check (repo-wide)
• pnpm typecheck (repo-wide)
• pnpm --filter @first-tree/client exec vitest run src/providers/grok/__tests__/events.test.ts src/providers/grok/__tests__/handler.test.ts (91 passed)
• pnpm test (repo-wide)

Change Surface

• apps/cli public CLI or help output
• tree onboarding / binding / inspection behavior
• shipped or planned skill topology
• docs or contributor-facing repository metadata
• CI / packaging / release plumbing

Notes

• package or install behavior changes: none
• docs or tests updated to match: Grok events + handler coverage for title-less completed updates, including preserved shell args/refs
• follow-up work: optional Working-lane TOOL_VERBS mapping for Grok names (run_terminal_cmd / run_terminal_command) so shells render as run <command> instead of use <title>

[yuezengwu]

Reviewed exact head 785dc09b099777d8b54908e0f5712125b9feeb25.

The Grok ACP patch itself looks sound. Independent exact-head validation passed: git diff --check, pnpm check, build (5/5), typecheck (9/9), the 91 focused Grok tests, and the full client suite (2,898 passed, 7 skipped). All substantive CI jobs are also green.

Blocking issue: Check Branch Name fails because jeremy/grok-unknown-tool-merge does not match the repository's required prefixes (feat/, fix/, refactor/, test/, docs/, chore/, or merge/). Please move this change to a compliant branch/PR (for example, fix/grok-unknown-tool-merge) so the required check can pass, then request a fresh exact-head review.

[L42y]

Superseded by #2388 — same exact head 785dc09b099777d8b54908e0f5712125b9feeb25 on the required fix/ prefix so Check Branch Name can pass.