keep-the-why: bump to 0.16.0

[oliver-zehentleitner-aigent]

Bumps the keep-the-why plugin entry to 0.16.0 in .github/plugin/marketplace.json and plugins/external.json (version and release ref), following #2984.

Release: https://github.com/oliver-zehentleitner/keep-the-why/releases/tag/v0.16.0 — a Codex plugin manifest as a third install route, the first-setup wizards stated as two messages, and a copy pass on the docs; nothing changes for an existing project.

[github-actions]

🔒 PR Risk Scan Results

Scanned 2 changed file(s).

Severity	Count
🔴 High	0
🟠 Medium	0
ℹ️ Info	0

✅ No matching risk patterns were detected in changed files.

This is an automated soft-gate report. Findings indicate review targets and do not block merge by themselves.

[github-actions]

🟡 Contributor Reputation Check: MEDIUM risk

Check	Risk
Profile	MEDIUM
Credential audit	NONE

Maintainers: please review this contributor before merging.
See the workflow run for full details.
Automated check powered by AGT.

[github-actions]

⚠️ External plugin PR checks passed with spec warnings

• Changed entries detected: 1
• Workflow state label: ready-for-review
• Status legend: ✅ pass · ⚠️ warning · 🛑 fail

Per-plugin quality summary

Plugin	spec compliance (non-blocking)	vally lint	install smoke test	version match	ref/sha consistency	canvas structure	overall	source tree
keep-the-why	⚠️ warning	✅ pass	✅ pass	✅ pass	⚪ not_run	⚪ not_run	✅ pass	v0.16.0

Gate output details

keep-the-why - spec compliance (⚠️ warning)

Agent Plugins v1.0.0 manifest warnings:
- $schema should be "https://agent-plugins.org/schemas/1.0.0/plugin.schema.json"
- top-level field "skills" is not part of Agent Plugins v1.0.0
- schema validation: manifest must have required property '$schema'
- schema validation: manifest must NOT have additional properties

keep-the-why - vally lint (✅ pass)

✅ keep-the-why (2/2 checks passed)
    ✓ [spec-compliance] All 1 skill(s) are spec-compliant.
        ✓ spec-compliance: All spec checks passed.
    ✓ [valid-refs] All file references across 1 skill(s) are valid.
        ✓ valid-refs: All file references resolve to existing files within the skill directory.

1 skill(s) linted, 1 passed

keep-the-why - install smoke test (✅ pass)

Install smoke test succeeded. Verified /tmp/external-plugin-quality-lx8XHI/copilot-home/.copilot/installed-plugins/external-plugin-intake/keep-the-why/plugin.json.

keep-the-why - version match (pass)

- v0.16.0: matched version "0.16.0" at "plugin.json".

keep-the-why - ref/sha consistency (not_run)

Ref/SHA consistency gate skipped because one of source.ref or source.sha was not provided.

keep-the-why - canvas structure (not_run)

Canvas structure gate skipped because plugin is not tagged with "canvas".

- keep-the-why: spec=warning, vally-lint=pass, install-smoke=pass, version-match=pass, ref-sha-consistency=not_run, canvas-structure=not_run, overall=pass