chore(release): kyberforge 1.6.0, marketplace 0.4.2

The four preceding commits change `plugins/kyberforge/.apm/` content that reaches
the compiled artifacts — three validators, a new reference file in each of
`skill-audit` and `skill-author`, and the authoring rules across both author
skills — so per `apm-workflow`'s configure policy the package earns a bump, minor
for the new capability.

Root `apm.yml`'s `executables.allow` key moves with it, in this commit and not a
later one. apm approves a package's `hooks/` and `bin/` by an exact
`<name>#<version>` dictionary lookup with no wildcard and no version-less form, so
a `kyberforge#1.5.0` key left behind a 1.6.0 package errors nowhere: the entry
stops matching, the `SessionStart` freshness hook stops deploying, and the install
goes quietly stale. That is the failure ADR-0019 records as having actually
happened, and `check-executables-allow-sync` exists to catch it.

The catalog bump was missing from the working tree and is added here.
`apm-workflow`'s marketplace policy is explicit that an existing entry's
`version:` moving earns the catalog a **patch** — the set of packages is
unchanged, only its metadata moved — and that the root `version:` stays in step
with `marketplace.version`, since apm audit reads one and the compiled manifest
carries the other. Nothing enforces this: `apm pack --check-clean` catches a bump
made in `apm.yml` but never re-packed, while a bump never made at all fails
nothing.

Manifests regenerated with `apm pack` plus `scripts/sync-marketplace-mirror.sh`
for `.github/plugin/marketplace.json`, which no apm output profile targets.
`.agents/plugins/marketplace.json` is unchanged — the codex profile's shape
carries no version field for either the catalog or its entries.

.github/plugin/marketplace.json

@@ -1,7 +1,7 @@
 {
   "name": "holocron",
   "description": "AI development skills for Claude Code and GitHub Copilot CLI — factory, design, implement, review, and cross-cutting workflows.",
-  "version": "0.4.1",
+  "version": "0.4.2",
   "owner": {
     "name": "Defame1297",
     "email": "defame1297@rkdr.net",
@@ -11,7 +11,7 @@
     {
       "name": "kyberforge",
       "description": "Skills and agents for creating, maintaining, and managing a Claude Code / Copilot CLI plugin marketplace.",
-      "version": "1.5.0",
+      "version": "1.6.0",
       "category": "Developer Tools",
       "source": "./plugins/kyberforge"
     },