D315 — Page names are linted: title and heading agree, titles are labels, map titles are short

Amended by D907: a map title its folder does not echo is only the map_create/map_update warning; kb_review map_naming lists the length and subtitle reasons, which a retitle can always clear.

Decision. title_h1_mismatch (warning, fix sync_h1) fires when a concept's frontmatter title and its first # heading both exist and differ; the repair overwrites the heading with the title. title_quality (info, no fix) fires on a decorative character, a title over title_max_length (default 100, per map), a lifecycle word when the concept has a status, a map's forbidden_title_terms, and a YYYY-MM slug outside a kind: journal map. map_naming also flags a map title poor on its own (over 30 characters, a subtitle over 20, no resemblance to its folder).

Why. On a real KB about a seventh of the concepts had a title and a heading that had drifted apart, and nothing reported it. The title is what concept_list, search, graph tools, generated indexes and the Atlas show, so the heading is the rendering and the one to rewrite; the reverse would make every reader of a concept parse its body. Quality rules are info because a long or decorated title breaks nothing, it only makes listings noisy, and they have no fix because the right wording is a judgement. A set of map titles consistent with each other can still be individually bad (D304 compared them only to each other).

Alternatives rejected. - Folding the mismatch into missing_title: a different condition with a different fix. - The heading as source of truth: every tool that reads a concept would need its body. - A mechanical fix for title_quality: it would invent wording. - title_max_length as a positive-only key like the cost keys (D301): 0 has to mean "off" for a map of long names, so 0 is stored and the update removes the key with a negative value. - Status words matched as substrings: active would flag "proactive". They match whole words. - Individual map-title problems as lint findings: renaming a map is a scheme decision, so they stay a review item.

Consequences. sync_h1 replaces the heading with plain text, so formatting in the old heading is lost; the check compares the raw heading text, so a bold heading over a plain title is reported and repaired. The folder-mismatch signal fires for a map titled in another language than its folder; the agent judges it from the evidence. The tools/list size budget moved to 25.5 KiB for the two new map_update parameters.