Add Vurnix Honest Gate extension to community catalog

[shiersa]

What

Adds Vurnix Honest Gate (vurnix) to the community extension catalog — a deterministic three-state honest gate for AI-written code.

Unlike rubric-driven review extensions, the judgment here is executable code, not agent self-review: the extension ships a provides.scripts bash wrapper around vurnix (zero-dependency PyPI checkers: compile + phantom-import + honest test count), and the verdict is its exit code — PASS (0) / BLOCK (1) / UNPROVEN (3). A missing toolchain, an empty test suite, or a missing vurnix install all exit 3, never 0: a check that cannot run is not a check that passed. The agent-facing command instructs the agent to relay the verdict verbatim and never soften it.

• Repository: https://github.com/shiersa/vurnix-spec-kit
• Release: https://github.com/shiersa/vurnix-spec-kit/releases/tag/v0.1.1
• Effect: read-only (the gate reads and verdicts; it never edits the project)

Verification

• extension.yml validates against the manifest rules from feat(extensions): accept provides.templates and provides.scripts in manifest #4012 (script name pattern, relative paths, runtimes)
• End-to-end tested on spec-kit main: specify init → specify extension add vurnix --from <release zip> → extension Enabled (1 command, 1 hook) → installed script run against PASS/BLOCK/UNPROVEN fixtures returns exit 0/1/3

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