* docs/building.md — how to build jj-commitd and planctl from source,
requirements, `go install` recipes, reproducible-build flags
(`-trimpath -ldflags="-buildid="` per planctl PRD R7.3), test +
benchmark commands, cross-compile, CI matrix link.
* docs/planctl.md — full command reference beyond --help: plan-dir
discovery cases A-D, all 9 classification codes with severity and
meaning, tag-grammar spec (including paren-aware annotations + the
tag-unclosed recovery semantics), the five EARS regexes and the
bold-prefix exemption, JSON schema, worked examples for pre-commit
/ CI / multi-plan / JSON consumers.
* docs/jj-commitd.md — architecture diagram, socket event protocol
(session-start, post-edit, session-end, shutdown, status) with
field tables, all env vars (REPO_ROOT, JJ_HOOK_DEBOUNCE_SEC,
JJ_HOOK_STALE_MIN, JJ_HOOK_AUTO_SQUASH), baked-in timing constants,
socket / log paths, fallback mode, troubleshooting.
* README.md — expanded the jj-commitd bullets and linked to each
reference from a new "Documentation" section; kept top-level
summaries terse.
