fix: correct double-bump in Version Packages PR title

[gkurt]

Bug

The versionPr.create() hook added in #60 titled the Version Packages PR chore: release v0.21.0 while the PR actually bumped to v0.20.0.

Cause

create() runs after the draft is applied (the github plugin's applyCliDraft), so this.graph already holds the bumped version. Calling draft.getPackageDraft(...).bumpVersion(pkg) then applied the minor bump a second time: 0.20.0 → 0.21.0. My original validation missed it because it ran against the unapplied draft (graph still at 0.19.0 → 0.20.0).

Fix

Read the already-applied version straight off the graph — no re-bump:

create() {
  const version = this.graph.get('npm:tegaki')?.version;
  return { title: version ? `chore: release v${version}` : 'chore: release' };
},

Reproduced in-memory against a probe changelog: .version → 0.20.0 (correct), bumpVersion(pkg) → 0.21.0 (the bug).

Note: the already-merged #59 keeps its wrong title (cosmetic; it bumped 0.20.0 correctly). This prevents it on future releases.

[github-actions]

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