chore(release): version packages

[davidwkeith]

Summary

Cuts the next beta release: consumes all 185 pending changesets and applies
their version bumps via pnpm changeset version (Changesets pre mode, tag
beta). No pending changeset was a major bump, so every package advances
within its existing 0.1.0-beta.N line — @dwk/cf-shims, @dwk/deno-host,
and @dwk/mf2 land their first 0.1.0-beta.0. No package reaches a stable
1.0.0; that stays blocked behind conformance (conformance/status.json
still shows most hosted suites as pending).

This is the version-bump step of the routine beta-release path in
RELEASING.md. After this merges to main,
the next steps (outside this PR) are a dry_run: true and then
dry_run: false dispatch of the Release GitHub Actions workflow to
actually publish to npm.

Packages affected

All 31 publishable workspace packages (see the diff for the full list);
@dwk/server and @dwk/conformance-target bump too but are never published
to npm.

Checklist

• Read the relevant spec(s) under spec/packages/ and updated them if
  behaviour changed — not applicable, no behaviour changed, version-only
• Added/updated colocated tests (src/*.test.ts) — not applicable,
  version-only change
• Ran the local CI gate: pnpm lint && pnpm format:check && pnpm typecheck && pnpm build && pnpm test
• Added a changeset (pnpm changeset) if this touches a publishable
  package — not applicable, this PR consumes the pending changesets
• Updated catalog.json / conformance/status.json if this adds a new
  mountable worker or changes conformance status — not applicable, no
  catalog/conformance changes; pnpm release:gate and
  pnpm catalog:check both pass

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[davidwkeith]

Reviewed for CONTRIBUTING.md conformance. This is a mechanical changeset version output (185 pending changesets consumed), and it checks out:

• PR title/scope: chore(release): version packages matches the precedent set by the last release PR (#377), which used the identical title — consistent with the Conventional Commits convention for a repo-wide chore.
• PR body: opened from the template with Summary / Packages affected / Checklist headings intact; unchecked items have one-line reasons rather than being deleted.
• Diff scope: touches only package.json versions, CHANGELOG.md additions, and .changeset/pre.json — no source changes, so "not applicable" on the tests/spec checklist items is accurate.
• Version bumps: all 31 packages bump by exactly one prerelease integer (beta.N → beta.N+1), no unexpected major bumps; @dwk/cf-shims, @dwk/deno-host, @dwk/mf2 correctly land their first 0.1.0-beta.0, matching the PR description.
• Pre-mode changeset behavior: individual .changeset/*.md files are intentionally not deleted (Changesets pre mode keeps them until pre exit), matching what #377 did — not a bug.
• CI: release-gate, integration, CodeQL, and catalog checks are green; build-test was still in progress as of this review.

No changes requested — nothing here needs fixing. (Note: couldn't submit as an "Approve" since this PR is authored by the same account this review is posted from — GitHub disallows self-approval.)

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