seo-meta-onpage

# seo-meta-onpage (M7) Head hygiene is cheap, deterministic, and the first thing every crawler reads. Reference: `references/schema-tier1.md` for the structured-data layer that sits alongside the head (owned by M5). ## Inputs Work from the PageSnapshot named in your dispatch envelope: read `parsed` from `<run_dir>/pages/<slug>.json` (`title`, `metas[]`, `robots_meta[]`, `canonicals[]`, `word_count`) plus `headers` (`content-language`, `x-robots-tag`); Grep `pages/<slug>.html` for verbatim evidence; site artifacts live in `<run_dir>/site/{robots.json,sitemaps.json,discovery.json}`. Deterministic findings already emitted by `audit.mjs` are listed in `<run_dir>/findings.deterministic.json` — do not re-emit those ids; add model-judged findings only. If invoked directly with a URL/path and no snapshot exists, first run `node "${CLAUDE_PLUGIN_ROOT}/scripts/snapshot.mjs" <target> --out "${CLAUDE_PLUGIN_DATA}/runs"` and use the printed snapshot path. ## Audits Working from the PageSnapshot (`parsed_rendered` when `render.used` is not `none`, else `parsed`): 1. **Title** — exactly one `<title>`. Length is judged against the **shared bands** in `scripts/lib/bands.mjs` (the single source; `parse-html.mjs`, the on-page checks and this skill all read it): **pass 30-60 characters**, **recommended 50-60**. Inside 50-60 the verdict is `recommended`; inside 30-60 but outside that, `pass`; below 30 `short`, above 60 `long` — both are `warn`, never `fail`. **Fail** only when the title is mis...