fix(scripts): the required-context self-test proves WIRING with invocations, not prose (#10877) (#10884)

* fix(scripts): check-required-contexts reads comments as prose, not as wiring (#10818)

`uncommentedYaml` dropped a line only when its first non-space character was
`#`, so a TRAILING `# --verify-required-set` on a live line — and a trailing
shell comment inside a `run:` block scalar — survived the strip and reddened
`Lint & Repo Gates` on prose.

A workflow stacks two comment grammars and one line filter was wrong about
both. Each now goes to the thing that knows it: `yaml.parse` for the YAML
layer, and check-shard-attestation's `shellCommands()` lexer — imported, not
re-typed — for the shell inside each `run:`.

Both limbs are pinned in `--self-test`: four prose shapes that must NOT read as
wiring, and six live shapes that must. The trailing-comment pair differs by the
`#` alone.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DdCnBGcHeufjrq7drTD3wt

* fix(scripts): the required-context self-test proves WIRING with invocations, not prose (#10877)

Two presence assertions in `--self-test` decided "is this wired up?" from text a
comment, a label or an `echo` could supply. Both error toward a silent GREEN —
the gate reporting that a required-context pin runs when it does not.

- the `lint` job block carried a second `/^\s*#/` line filter and matched
  `/run: pnpm check:required-contexts\b/` over a raw text slice. It is now a
  structural read of `jobs.lint.steps`. The slice was also bounded by
  `'\n  typecheck:'`, which is not the job after `lint:` — measured, it covered
  five jobs.
- the caller sweep's single equality was two assertions in opposite directions
  sharing one WIDE recognizer. Split: the absence half keeps `wiresLiveRead`,
  the presence half gets `invokesLiveRead`.

The two recognizers are deliberately different widths and are pinned together,
including one case where they disagree by design.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DdCnBGcHeufjrq7drTD3wt

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Co-authored-by: Claude Opus 5 <noreply@anthropic.com>

Author: os-zhuang