docs: add OPSTACK-HANDOFF.md; install the 39 Unreal skills

Handoff: a pasteable resume prompt at the plugin root -- read order, exact state
(Phase 0.5 green, Phase 1 done and measured, step 3 written but not compiled),
the immediate next action, hard rules, open items, and the method lesson from
this session.

Skills: Jahni's UE library was at .claude/skills/core/<name>/SKILL.md, two levels
deep, where Claude Code discovers skills one level deep -- so none of the 39 were
loading. Flattened; 124 reference files intact, all frontmatter valid, folder
names already matched their name: field. core/category.md left as documentation.
Confirmed loading.

They are untracked and cannot be tracked without un-ignoring .claude/ itself
(git cannot re-include a file whose parent directory is excluded). Same shape as
AUDIT P1; flagged, not actioned.

Note for the next session: module-and-build-system documents PCHUsage, shared
PCHs and IWYU -- the exact mechanism that blocked C10's settling experiment. That
skill was in the repo, undiscovered, while it was worked out the slow way.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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@@ -811,3 +811,28 @@ connectivity, same feel. That is §2.6's bar, and it is the last thing Phase 1 n
`OPSTACK-DECOMPOSITION §10.4` starts with FlatPlain + CrystalChamber collapsing into one op.
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## 2026-07-27 — session handoff written. 39 UE skills installed.
**`OPSTACK-HANDOFF.md`** added at the plugin root: a pasteable resume prompt for a fresh session.
Read order, exact current state, the immediate next action, the hard rules, the open items, and the
method lesson from this session.
**39 Unreal skills installed.** Jahni dropped a UE skills library into `.claude/skills/`, but nested
as `.claude/skills/core/<name>/SKILL.md` — two levels deep, where Claude Code discovers skills one
level deep at `.claude/skills/<name>/SKILL.md`. None were being loaded. Flattened (39 SKILL.md, 124
reference files, all frontmatter valid, folder names already matched `name:`); `core/category.md`
left in place as documentation. Confirmed loading.
⚠️ **They are untracked**: `.gitignore` starts with `*`, and git cannot re-include a file whose parent
directory is excluded, so nothing under `.claude/` can be tracked without un-ignoring the directory
itself. Same shape as AUDIT P1. Flagged to Jahni, not actioned — vendoring a reference library into
the plugin repo is his call.
**Immediately relevant to open work:** `module-and-build-system` documents `PCHUsage` / shared PCH /
IWYU — i.e. the exact mechanism that blocked §C10's settling experiment. That skill was in the repo,
undiscovered, while it was worked out the slow way. Worth reading before clearing the IWYU debt.
**Next single action unchanged:** build Phase 1 step 3, then the visual A/B on a Maze strate.
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