update_doc_section

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Replace a single section of a workspace's doc body, identified by its heading text. The targeted edit complement to `update_doc` (full replacement) and `append_doc_section` (append-only at the end). Use this when the agent maintains a recurring section (e.g., a 'Status' block in a launch-prep doc, an 'Outcomes' block in a meeting note) and only needs to refresh that one piece. Without it, agents are forced into 'GET → splice → PUT' which costs tokens, costs latency, and races against any concurrent human edit elsewhere in the doc (last-write-wins clobbers). Section semantics: the FIRST heading whose plain text matches `heading` exactly (case-sensitive on trimmed text) is found, and everything from that heading up to the next heading at the same OR shallower level is replaced. So a `## Outcomes` section ends at the next `## …` or `# …`; nested `### …` subsections stay part of the replaced range. Returns 404 when no matching heading exists; strict by design so a misremembered heading fails loudly. `markdown` is the FULL replacement, INCLUDING the heading line: pass it back as-is to keep the heading, change it to rename or rewrite the heading, change the heading level, or omit the heading entirely (collapses the section into the prior one). Empty `markdown` deletes the section. Same markdown surface as update_doc / append_doc_section (CommonMark + GFM + `` images + lone-URL videos (mp4/webm/mov/mkv/m4v) + Mermaid + KaTeX + callouts + SVG + details + cross-refs + @-mentions + URL embeds). Identity / attribution / events / doc-guard all flow through the same writeDocBody path as the other doc endpoints, so @-mentions in the new section fire `doc.mention_added` for newly-added mentions just like update_doc does. Requires editor role. Multi-surface workspaces optionally accept `surface_slug` to target a specific doc tab.