[nevermemo]

Cleanup after cycle 1, slice S2a (docs only).

• Roadmap rows are classified by remaining obligation. Fully done rows leave the roadmap; each outcome is in docs/decisions.md, either in an existing row or in a new one (d565-d570, d572). Partly done rows keep only their open part and point to the log ids. Open rows are unchanged apart from stale facts.
• "Now and next" describes the state after cycle 1: implementation complete, cleanup running, then the owner's cut and the report questions, then cycle 2. Every fact in the old section is either kept or in the log (checked by the reviewer).
• The "Cycle 1 time estimate" subsection is history now and becomes d565.
• New log rows: d565 (time estimate outcome), d566 (N21), d567 (N18 a, c, d, e), d568 (N112, N113), d569 (N115), d570 (tokio 1.54.1 for RUSTSEC-2026-0386, PR 224, which had no row), d571 (rule 10), d572 (N123, so the id stays traceable).
• docs/development/documentation.md rule 10: the append-only log is exempt from the line target.
• roadmap.md 333 -> 252 lines; decisions.md appended only (551 -> 559 lines), no old row edited.

Information-loss check: a section and token inventory of every tracked Markdown file was compared before and after. Every token that left the docs entirely came from a removed done row whose outcome is in the cited log row. The exception was N123, which now has d572. Several xtask commands (mine-transcripts, gold external, gold strata, maps baseline, maps trajectories) were described only in done roadmap rows; their user docs come in a later cleanup slice (README and guides). PR numbers 160, 177, 183 and 189 now appear only in git history.

Review: a separate reviewer checked 26 removed rows and every trimmed row against the log, the new rows against git, and the "Now and next" facts; its fixes are applied in the second commit.

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