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.

This replaces #2387. Same exact head 785dc09b099777d8b54908e0f5712125b9feeb25; the previous PR was blocked because jeremy/grok-unknown-tool-merge is not a required branch prefix.

Validation

• biome check on the four changed Grok files
• Independent exact-head review of fix(client): keep Grok tool names across ACP tool_call_update patches #2387: git diff --check, pnpm check, build (5/5), typecheck (9/9), 91 focused Grok tests, full client suite (2,898 passed, 7 skipped)
• pnpm --filter @first-tree/client exec vitest run src/providers/grok/__tests__/events.test.ts src/providers/grok/__tests__/handler.test.ts (91 passed)

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]

Approved exact head 785dc09b099777d8b54908e0f5712125b9feeb25.

The replacement PR uses the compliant fix/grok-unknown-tool-merge branch, and its CI run 33833392072 is fully green. The implementation preserves last-known Grok tool metadata across title-less ACP completion patches without weakening the existing replay/effect classification.

Independent validation on this exact head passed: git diff --check, pnpm check, build (5/5), typecheck (9/9), and 91 focused Grok tests. The same exact head also passed the full client suite (2,898 passed, 7 skipped) during the immediately preceding review.