aitask-gate-docs-updatedlisted

## Purpose This is the **verifier for the `docs_updated` gate** — a *procedure-backed* (`kind: procedure`) gate. Unlike a command verifier (build/tests/lint), it is a **skill run by the attended agent**: it inspects the task's change, updates the project's user-facing / design documentation per the project's doc-update spec (**confirming with the user**), and records the gate result in the ledger. The headless engine (`ait gates run`) never executes this — it reports the gate as `needs agent` and defers to the attended task-workflow / aitask-resume path, which starts the run and Read-and-follows this skill. This skill is **project-agnostic**: it reads *how* to update docs from the project's configured guide (never from any framework-internal convention doc). ## Contract **Invocation** (positional args, from the dispatch seam): ``` <task-id> <attempt> <run-id> ``` `<attempt>` and `<run-id>` are allocated by the dispatch seam via `aitask_gate.sh begin-procedure <task-id> docs_updated` (which already opened the `running` block). **Reuse `<run-id>` verbatim** when appending the terminal block. Do **not** invent these values. **Terminal status semantics (record exactly one):** | Status | When | |--------|------| | `pass` | The procedure **performed the required doc work**, OR inspected the doc-relevant surfaces and **confirmed the existing docs are already correct**. | | `skip` | The procedure **evaluated the task and concluded `docs_updated` is not applicable** to this ch