fix(release): use a compatible Conventional Commits preset

[zoeyrose]

Summary

Fix the Semantic Release failure on main after the dependency update: release-note generation fails with Missing helper because the newer Conventional Commits preset requires a newer changelog writer than the stable release plugin supplies.

Implementation / behavior

• Use the compatible stable preset through the normal ^9.3.1 dependency range and standard npm lockfile.
• Exercise the actual configured release-note generator with feature, fix, and breaking-change fixtures during the existing checks.
• Document the release-note compatibility boundary. No custom dependency locks, exact-version gates, overrides, or advisory exceptions are introduced; TypeScript remains on version 6.

Validation

• Independently reviewed exact commit 70afebeb4f9543e3b9b0af7a9e4f156a077d6543.
• Reproduced the original error with the previous dependency tree; the new functional regression passes.
• Clean installation, dependency graph, all 78 tests, build, deployment dry run, and release dry run passed in the immutable build image.
• Fresh baseline-versus-candidate audit: 46 existing findings, zero new or worsened findings.
• GitHub Linux and Windows validation, Conventional PR title, both CodeQL analyses and security gate, and Cloudflare Pages preview all passed on the published head.

Limitations / follow-up

Actual release publication runs after merge; local validation invokes only release-note generation and packaging dry runs. This PR does not approve a merge or dispatch a release/deployment.

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