[Doc Drift] README filter section missing new features and link to detailed docs

[github-actions]

What drifted

The README's apiops extract section describes --filter with a minimal example but does not mention:

• !-prefix exclusion entries (e.g. '!prod-legacy-*') added in PR Support !-prefix exclusions in filter entries #222
• The policies filter key (singleton — use - 'policy' or []) added in PR Honor filter for service-level policy; document policies key and sub-filters #221
• Any link to the detailed filter reference in docs/commands/extract.md or docs/guides/filtering-resources.md

Source of truth

• docs/commands/extract.md — complete filterable key table (17 keys including policies) and !-prefix exclusion syntax
• docs/guides/filtering-resources.md — negation/exclusion section added in PR Support !-prefix exclusions in filter entries #222
• Commits: 1908924 (feat: !-prefix exclusions), 32cf558 (fix: policies key)

Affected documentation

• README.md — the apiops extract section and its filter subsection

Suggested update

Add a brief note to the README filter flag row or example about !-prefix exclusions and point readers to docs/commands/extract.md for the full filterable key list. For example, update the flag table description from "Extract only matching resources" to something like "Extract only matching resources (supports wildcards and ! exclusions — see filter docs)".

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