Enforce WebJs brand casing with one simple prose-only hook rule

[vivek7405]

Problem

The brand WebJs is a proper noun and should read capitalized wherever it names the project in prose (sentence start AND mid-sentence), staying lowercase webjs only as a literal code token. PR #851 added enforcement for the sentence-start position only. A follow-up attempt used a hardcoded ~60-word English verb allowlist to catch mid-sentence uses, which is brittle by construction (an open word class is never complete and is unmaintainable).

This issue tracks replacing both with one simple, blunt rule, plus a one-time corpus fix, following the em-dash pattern the repo already uses (purge existing violations, then block new ones).

Design / approach

One unified inverted rule. A standalone lowercase webjs in prose IS the brand and is flagged, with only two structurally-detectable exclusions (no open-ended word list):

1. Literal code. Fenced and inline code spans are stripped, and the token forms (@webjsdev, webjs.dev, "webjs", WEBJS_*, webjsdev/webjs, <webjs-suspense>, bare identifiers like const webjs =) are excluded for free by the word boundary and the follower rule.
2. The CLI command surface. webjs <subcommand> is the one finite, real, closed list that is subtracted, kept in sync with the CLI by a drift-guard test.

The follower is a following word or a sentence-ending period only, so the rule never false-blocks real code (biases to false negatives like the em-dash rule).

Implementation notes (for the implementing agent)

• Enforcement: .claude/hooks/block-prose-punctuation.sh, rule 5 (the same hook that bans em-dashes as rule 1). Replaces the prior sentence-start block and the rejected verb allowlist. The webjs_cli variable holds the subcommand list.
• Tests: test/hooks/block-prose-punctuation.test.mjs, including the drift-guard that asserts the hook list covers the case labels in packages/cli/bin/webjs.js.
• Doc: AGENTS.md invariant item 11.
• Landmine: the hook is repo-only. The scaffold copy at packages/cli/templates/.claude/hooks/block-prose-punctuation.sh and the examples/blog copy deliberately carry NO brand rule (a generated user app is not webjs-branded). Do not add it there.
• Landmine: a one-time fix across docs must skip literal code. Markdown backtick masking can drift on backtick-dense lines and wrongly capitalize a backticked literal (this happened once with VS Code command titles and was caught in review). Verify by parsing code spans, not just grepping.
• Excluded from the one-time fix: changelog/ (auto-generated), scaffold templates, .sh hooks, CI.

Acceptance criteria

• One unified brand rule in the hook, no verb/noun allowlist
• Catches every mid-sentence brand use, not a fixed verb set
• Never false-blocks real code (if (!webjs), const webjs = ..., CLI commands, token forms)
• CLI drift-guard test against bin/webjs.js
• One-time corpus fix across AGENTS/README/agent-docs/docs-site/website/package-comments
• AGENTS.md invariant updated
• Tests green (19/19)

Shipped in #855 (this issue is filed retroactively for board tracking; supersedes the sentence-start-only enforcement from #851).

[vivek7405]

Resolved by #855 (merged as f41d105). Filed retroactively for board tracking.