Document missing internal dependencies in parser, cli, and workflow specs

[Copilot]

The spec-librarian audit found three package specs whose ## Dependencies sections had drifted from the actual non-test imports. This is a documentation-only change.

Changes

• pkg/parser/README.md — added syncutil (OnceLoader for lazy schema compilation in schema_compiler.go)
• pkg/cli/README.md — added colorwriter (Degrade in compile_schedule_calendar.go), ctxutil, and githubapi (ClientOptions in update_check.go)
• pkg/workflow/README.md — added ctxutil (OrBackground in auto_update_workflow.go, compiler_model_pricing.go, github_cli_wasm.go)

Descriptions reuse the wording already established for these packages elsewhere in the specs.

Notes for reviewers

The audit also flagged stringutil as undocumented in pkg/parser/README.md, but it was already present — no change was needed there.

Each addition was checked against real usage sites rather than taken from the report. Coverage was verified by diffing documented entries against actual imports:

for p in parser cli workflow; do
  go list -deps=false -f '{{range .Imports}}{{println .}}{{end}}' ./pkg/$p \
    | grep '^github.com/github/gh-aw/pkg' | sort -u \
    | while read i; do grep -q "$i\`" pkg/$p/README.md || echo "MISSING: $i"; done
done

All three packages now report zero missing entries.

Two audit action items are intentionally not addressed here: the shallow-clone/git-history item concerns the audit workflow's checkout configuration rather than package specs, and issue linking is handled separately.

• Fixes [spec-librarian] Specification Audit — 2026-08-08 — 3 issues found #51379

[Copilot]

Pull request overview

Updates package specifications to resolve dependency-documentation gaps identified in issue #51379.

Changes:

• Documents syncutil in the parser specification.
• Documents colorwriter, ctxutil, and githubapi in the CLI specification.
• Documents ctxutil in the workflow specification.

Show a summary per file

File	Description
pkg/parser/README.md	Adds the parser’s syncutil dependency.
pkg/cli/README.md	Adds three missing CLI internal dependencies.
pkg/workflow/README.md	Adds the workflow package’s ctxutil dependency.

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• Files reviewed: 3/3 changed files
• Comments generated: 0
• Review effort level: Balanced