[WRONG BRANCH] fix(cursor): bind exec result guidance to exact tool identity

[luvs01]

Motivation

• A previous change classified tools as the Codex exec bridge using substring/namespace containment which misidentified unrelated namespaced tools and caused empty exec outputs to be rewritten.
• The normalization must only apply to the actual Codex exec/shell bridge identities and must preserve an incoming isError:true state.

Description

• Introduce CODEX_EXEC_BRIDGE_TOOL_NAMES and tighten isCodexExecBridgeTool to require either a bare recognized bridge name, the exact opencodex-responses namespace paired with a recognized name, or an exact MCP display-alias match such as mcp_opencodex-responses_<name> / mcp__opencodex-responses__<name>.
• Preserve the incoming isError value when emitting the empty-exec guidance so existing error states are not overwritten.
• Add regression tests to tests/cursor-exec-empty-result.test.ts covering reserved-namespace exact matching, unrelated namespaced exec pass-through, alias matching, and error-state preservation.

Testing

• Ran the focused tests with bun test tests/cursor-exec-empty-result.test.ts tests/cursor-toolresult-normalize.test.ts, and the changed/related tests passed (27 tests, all assertions succeeded).
• Ran the TypeScript check with bun run typecheck and bun run privacy:scan; both checks passed for the scoped changes.
• A full repository test run (bun run test) exercised many unrelated suites and exposed existing, unrelated timeouts/authentication-status mismatches; the focused Cursor regressions introduced here remain green.

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[github-actions]

✅ Deterministic PR hygiene checks passed.

[github-actions]

⏳ DRAFT

• wrong target branch (main); retarget to dev.

What to do

• Retarget this PR to dev — all contributions go to dev.

Its title has been prefixed with [WRONG BRANCH].
This pull request was already a draft. Its draft status will be preserved after every issue above is resolved.