fix(writings): repair software-virtues-revisited frontmatter

[klappy]

What

Fixes the May 10 essay writings/software-virtues-revisited.md so it actually appears on the homepage.

Why it was invisible

The doc-listing Supabase function (which feeds the homepage) silently filters out entries whose frontmatter doesn't conform. This essay had:

Field	Was	Now	Note
exposure	published	public	published is not a valid value. Canon allows nav | public | draft | hidden | internal.
voice	klappy	first_person	Not in voice enum either.
type	(missing)	essay	Renderer cannot select template without this.
slug	(missing)	software-virtues-revisited	Renderer cannot generate page URL without this.
public	(missing)	true	Boolean, unquoted.
hook / description / subtitle / author / og+twitter	(missing)	backfilled	Pulled from author's own opening blockquote — no new content invented.

Both crash patterns above are documented in klappy://canon/constraints/frontmatter-validation-before-merge § Known Crash Patterns. The canon constraint mandates automated schema validation pre-merge; the implementation gap (canon-quality.yml only audits klappy:// reference integrity, not frontmatter schemas) will be closed in a follow-up oddkit PR adding a frontmatter-schema rule pack to oddkit_audit.

Verification

• Frontmatter parsed with PyYAML, all eight universal fields present, all enum values in their canon-allowed sets, no public:false + exposure:public contradictions, no quoted-boolean issues.
• Body untouched (160 lines preserved verbatim).

Canon

• klappy://canon/constraints/frontmatter-validation-before-merge
• klappy://canon/meta/frontmatter-schema

---

Note

Low Risk
Low risk: changes are limited to frontmatter metadata (enums/required fields) to make the essay render/list correctly; no application logic changes.

Overview
Fixes writings/software-virtues-revisited.md frontmatter to conform to the site’s expected schema so the essay is eligible for listing/rendering.

Adds missing required metadata (type, slug, public, plus social/discovery fields) and normalizes invalid values (e.g., exposure: public, voice: first_person) while leaving the body content unchanged.

^{Reviewed by Cursor Bugbot for commit f3f2a40. Bugbot is set up for automated code reviews on this repo. Configure here.}

[github-actions]

Canon Quality — oddkit_audit ✅

No dead klappy:// references or legacy link patterns found in writings/. 41 files scanned.

_{Spec: klappy://docs/oddkit/specs/oddkit-audit · Workflow: .github/workflows/canon-quality.yml · Run: #117}