docs: rewrite global CLAUDE.md and add environment changelog (TKT-021)

config/claude/CHANGES.md

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+# ~/.claude/CHANGES.md
+
+Location-scoped changelog for the home environment. Records shifts that matter across
+projects: directories that moved, conventions that were renamed, tools that changed shape.
+`CLAUDE.md` points here. When an expected path is missing or the environment seems
+rearranged, read this before improvising, because a vanished path is often a recorded move
+rather than a mistake to route around.
+
+Entries append at the bottom, newest last, and are not edited once written.
+
+## 2026-07-21 The docs standard and its instance directory were renamed to engrata
+
+The documentation standard, its repository, and the per-project instance directory were
+all renamed on this date. Literal old and new names:
+
+- Standard name: `docs-system` became `engrata`.
+- Standard repository: `~/Code/misc/docs/docs-system` became `~/Code/misc/docs/engrata`.
+- Instance directory: `.docs` became `.engrata`.
+- Citation form inside an adopting project: `docs-system/NNNN` became `engrata/NNNN`.
+
+Both generations are supported during the transition. Most projects in the fleet still hold
+a `.docs` directory, because the rename reached the standard first. Where `.engrata` exists
+it is the working layer, and where it is absent a legacy `.docs` is the same thing. Old
+names surviving in frozen records, session notes, and commit messages are history and stay
+as written.
+
+The machine-global gitignore (`~/.gitignore`, sourced from
+`config/git/gitignore` in dotfiles) carries both a `.engrata` line and a `.docs` line for
+the duration of the transition, so neither generation of the instance directory appears in
+a parent repo's `git status`.
+
+Recovery gap during the transition window: a dotfiles-only restore before this commit
+lacked the `.engrata` guard, so projects renamed to `.engrata` before it relied on a
+hand-added `.engrata` line in the deployed gitignore or on repo-local guards to stay
+ignored. This commit folds the guard into the managed source, closing the gap for restores
+after it.
+
+## 2026-07-21 Possible move of the code root from misc to workspace
+
+The code root `/Volumes/Code/misc/` may migrate to `/Volumes/Code/workspace/`. The shape of
+the change is not yet decided: `~/Code` may be repointed, or a new `~/workspace` symlink may
+appear alongside it. All of this is TBD as of this entry.
+
+If a `/Volumes/Code/misc/...` path has vanished, check whether this move happened before
+treating it as missing. Absolute paths into `misc/` appear in rules files and in engrata
+docs across the fleet, including this environment's pointer to the engrata standard at
+`~/Code/misc/docs/engrata`. When the move lands, update any engrata docs that cite a
+`misc/` path.