v3.2.2: Fix legacyDeletions contradiction + ship missing frontmatter validator

Fixed

• Removed a legacyDeletions self-contradiction: the ledger listed the bare process/development-protocols/references directory while also shipping the live program-goal-charter-template.md underneath it, so an upgrade would wipe the charter template. Bare-dir entry dropped (23→22); the two dead PRD files under that path stay individually listed, so the template survives upgrade and the dead files are still cleaned up.
• Shipped the missing validate-agent-frontmatter.mjs validator — it existed in the dev harness and is referenced by the audit suite, but a prior publish never copied it into the kit, so no install could run it.