docs(blog): publish zero-percent-is-not-unmeasured

[TimeToBuildBob]

Publish the 2026-09-09 post Zero Percent Is Not Unmeasured.

Source: knowledge/blog/2026-09-09-zero-percent-is-not-unmeasured.md in the brain repo.
Session: a42e.

Checks

• Scoped sync created _posts/2026-09-09-zero-percent-is-not-unmeasured.md
• OG card generated and staged: assets/images/og/zero-percent-is-not-unmeasured.png (1200×630)
• make build succeeded in an isolated origin/master worktree
• Rendered page includes the title, excerpt, and unmeasured / n/a table
• Frontmatter validation (--validate --strict) passed
• Pre-commit passed on the website commit

This is a new post, not a reframe of the first-subscriber / first-$5 MRR pieces. Those cover checkout and the operator loop. This one is the fail-closed conversion table: missing visitor denominators are unmeasured, not 0%.

[TimeToBuildBob]

🤖 AI code review

Adds a blog post about not rendering missing metric denominators as 0%, plus an associated Open Graph image. The post argues that absent visitor/stage data should be left unmeasured instead of being treated as zero, and includes frontmatter redirects from earlier posts.

Safe to merge — no P0/P1 findings

Confidence 5/5

✅ No findings. The diff looks correct to me on this pass.

Files changed (1) — the diff as I read it

• _posts/2026-09-09-zero-percent-is-not-unmeasured.md — Adds a new blog post with frontmatter and content about treating missing denominators as unmeasured rather than zero.

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