docs: migrate workflow to DooPlex-local execution

CHANGELOG.md

@@ -1,3 +1,22 @@
+## docs — the workflow moved to DooPlex-local execution (2026-07-19)
+
+**Docs only, no version bump, no code change.** Claude Code now runs on DooPlex (192.168.0.180,
+Debian 13, `kisfenyo`) instead of the Windows workstation, working directly in
+`/mnt/5_hdd/felhom.eu/git/felhom-agent`.
+
+- `CLAUDE.md` — the build/deploy table is now local-first: build on DooPlex, then **one** hop
+  `scp /tmp/felhom-agent-<v> felhom-pve:/tmp/`. The old path went build-server → Windows box →
+  felhom-pve, needing `cygpath -w` for the local scp path; that two-hop detour and its CRLF hazard
+  are gone (recorded in the new "Legacy: Windows workstation" note, not deleted).
+- **New clean-tree gate** before any build: `git status --porcelain` empty AND `HEAD` ==
+  `origin/main` — the CC working tree is now the tree that gets built. An unpushed change does not
+  exist.
+- `MSYS_NO_PATHCONV=1` is no longer needed for `pct` (it was an MSYS path-mangling workaround);
+  `ssh felhom-pve` is plain now. Selftests run locally on DooPlex against the demo API.
+- Workspace-root pointer updated to `/mnt/5_hdd/felhom.eu/git/CLAUDE.md`.
+
+Historical Windows references in past CHANGELOG entries and `PLAN.md` are left untouched.
+
 ## build tooling — the golden bakes EVERY infra image, asked from the controller (2026-07-19)
 
 **No agent version bump: `configs/build-golden.sh` only (v2.0.0 → v2.1.0). Effective at the NEXT