chore(release): version packages

[davidwkeith]

Summary

pnpm changeset version for #514: @dwk/activitypub 1.0.0-beta.4 → 1.0.0-beta.5 (consumes .changeset/actor-profile-url.md into pre.json, writes the CHANGELOG entry). Versioning lands via PR because main's ruleset forbids direct pushes; the publish itself is the manual Release workflow per RELEASING.md (dry run, then dry_run: false).

Packages affected

@dwk/activitypub

Checklist

• Read the relevant spec(s) under spec/packages/ and updated them if
  behaviour changed — not applicable: version/changelog only, no behaviour change
• Added/updated colocated tests (src/*.test.ts) — not applicable: no code change
• Ran the local CI gate: pnpm lint && pnpm format:check && pnpm typecheck && pnpm build && pnpm test — CI runs the identical gate on this PR; the same tree passed it on feat(activitypub): emit the actor document's profile-page url #514
• Added a changeset (pnpm changeset) if this touches a publishable
  package — not applicable: this PR consumes the changeset
• Updated catalog.json / conformance/status.json if this adds a new
  mountable worker or changes conformance status — not applicable

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