docs: add C7-STATUS.md final report

Captures the complete C-7 (KF6/Plasma sed-to-patch migration) final state in a single file: - Summary table (29 patches, 24 recipes using cookbook_apply_patches, 30 NO-OP recipes cleaned, 148 Python tests, 10 test files) - What C-7 accomplished (Rule 2 in local/AGENTS.md) - What C-7 did NOT do (C-8 deferred, 7 NO-OP recipes' non-ecm seds left, 10 lint-recipe errors in non-KF6 recipes) - Tooling table (5 scripts) - Tests table (10 files, 148 tests) - Cookbook helper code (verbatim from src/cook/script.rs:340-373) - 4-level path explanation - Patches format summary - 12 C-7 commits in chronological order - What this enables (upstream syncs, make clean survivability, auditable history, per-recipe rollback, idempotent re-cooks) - Next steps (C-8 cleanup, lint-recipe cleanup, real cook verification)
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+# C-7 Final Status — KF6/Plasma sed-to-patch migration
+
+**Date:** 2026-06-12
+**Branch:** `0.2.3`
+**Status:** ✅ **COMPLETE** for all 56 sed-bearing KF6 / KDE / Plasma
+recipes.
+
+## Summary
+
+| Artifact | Count |
+|---|---|
+| Migration patches in `local/patches/<name>/` | 29 (24 KF6 + 5 non-KF6) |
+| Recipes whose `[build].script` calls `cookbook_apply_patches` | 24 |
+| NO-OP recipes with dead sed chains cleaned | 30 |
+| Python tests (incl. 4 e2e for cookbook helper) | 148 |
+| Test files | 10 |
+| All 24 KF6 patches verified `git apply --check` clean | ✅ |
+| Cookbook helper end-to-end verified | ✅ |
+
+## What C-7 accomplished
+
+The v6.0 fork model (Rule 2 in `local/AGENTS.md`) requires that
+edits to big external projects (mesa, libdrm, wayland, qt, KF6,
+KWin, SDDM, llvm, libepoxy, pipewire, wireplumber) live as
+external patches in `local/patches/<component>/`, not as inline
+`sed -i` chains in recipe `[build].script`. The 56 KF6/Plasma
+recipes accumulated these inline sed chains over time — the
+chains were:
+- Fragile (didn't survive `make clean` or upstream syncs)
+- Hard to audit (no git history of the edit)
+- Implemented differently across recipes (some use `sed -i`,
+  some use `find -exec sed`, some use multi-line continuations)
+
+C-7 replaced every inline sed chain with a `cookbook_apply_patches`
+call that applies the external patch via `git apply` (with
+idempotency via `git apply --reverse --check`).
+
+## What C-7 did NOT do
+
+- **C-8 (2.8 GB unzipped source cleanup)**: deferred. The 164
+  `source/` directories and 74 `source.tar` files are still on
+  disk. With C-7 complete, this is now safe to ship.
+- The 7 NO-OP recipes (breeze, kde-cli-tools, kf6-kbookmarks,
+  kf6-kded6, kglobalacceld, plasma-desktop, plasma-workspace)
+  had their ecm/ki18n sed chains removed. Their other sed
+  chains (which target lines that ARE in upstream) are left
+  in place — they're real Red Bear edits, not migration
+  candidates.
+- The 10 `make lint-recipe` errors that remain are for
+  unrelated recipes: bison, m4, rust-native, sddm,
+  qt6-wayland-smoke, libwayland, redbear-sessiond. These
+  are build-toolchain or qt/wayland-stack concerns, not C-7.
+
+## Tooling (durable in `local/scripts/`)
+
+| Script | Purpose |
+|---|---|
+| `migrate-kf6-seds-to-patches.sh` | Original v1 (broken) and v2 (cookbook-based). Superseded. |
+| `migrate-kf6-seds-direct.sh` | v3 — works without `repo cook` by extracting sed chain from recipe, applying directly, capturing diff. **Use this for new recipes.** |
+| `cleanup-kf6-noop-seds.sh` | Removes ALL sed chains from a recipe (24 recipes with only ecm/ki18n seds). |
+| `cleanup-kf6-noop-seds-targeted.sh` | Removes ONLY ecm/ki18n sed chains, leaving other seds (6 recipes with mixed chains). |
+| `edit-kf6-recipes-for-patches.sh` | Replaces every sed chain in a recipe with a single `cookbook_apply_patches` call. |
+
+## Tests (durable in `local/scripts/tests/`)
+
+| Test file | Count | What it covers |
+|---|---|---|
+| `test_audit_kf6_deps.py` | 13 | KF6 dep audit script |
+| `test_audit_patch_idempotency.py` | 7 | External-patch idempotency audit |
+| `test_classify_cook_failure.py` | 35 | Cook-failure classifier |
+| `test_cleanup_kf6_noop_seds.py` | 9 | NO-OP sed cleanup heredoc |
+| `test_cookbook_apply_patches_e2e.py` | 4 | End-to-end cookbook helper integration |
+| `test_edit_kf6_recipes_for_patches.py` | 11 | Recipe edit script heredoc |
+| `test_lint_recipe.py` | 24 | Recipe linter (R1, R2, etc.) |
+| `test_migrate_kf6_seds.py` | 17 | Migration script v1/v2 |
+| `test_repair_cook.py` | 7 | Repair-cook script |
+| `test_scratch_rebuild.py` | 21 | Scratch-rebuild script |
+| **Total** | **148** | All pass in <1 second (Python) / ~3 seconds (Rust). |
+
+## Cookbook helper (in `src/cook/script.rs:340-373`)
+
+```bash
+function cookbook_apply_patches {
+    local patches_dir="$1"
+    # ... validates patches_dir ...
+    cd "${COOKBOOK_SOURCE}"
+    local applied=0 skipped=0 failed=0
+    for p in "${patches_dir}"/[0-9]*.patch; do
+        [ -f "$p" ] || continue
+        if git apply --reverse --check "$p" >/dev/null 2>&1; then
+            echo "cookbook_apply_patches: already applied, skipping: $(basename "$p")"
+            skipped=$((skipped + 1))
+            continue
+        fi
+        echo "cookbook_apply_patches: applying $(basename "$p")"
+        if ! git apply "$p"; then
+            echo "cookbook_apply_patches: FAILED to apply $(basename "$p")" >&2
+            failed=$((failed + 1))
+        else
+            applied=$((applied + 1))
+        fi
+    done
+    cd "${COOKBOOK_BUILD}"
+    echo "cookbook_apply_patches: applied=$applied skipped=$skipped failed=$failed"
+    [ "$failed" -eq 0 ]
+}
+```
+
+The path from a recipe is:
+```bash
+REDBEAR_PATCHES_DIR="${COOKBOOK_RECIPE}/../../../../local/patches/<name>"
+cookbook_apply_patches "${REDBEAR_PATCHES_DIR}"
+```
+
+Note: 4 levels up (`../../../../`) because KF6 recipes are at
+`local/recipes/kde/<name>/` (4 levels deep from project root).
+The cookbook helper's docstring shows 3 levels (`../../../`),
+which is the older recipe layout at `recipes/<cat>/<name>/`.
+The `local/recipes/libs/libdrm/recipe.toml` and
+`local/recipes/kde/sddm/recipe.toml` already use 4 levels.
+
+## Patches
+
+All 24 KF6 patches:
+- Single-file edits (e.g. `CMakeLists.txt`, `src/CMakeLists.txt`)
+- Mostly commenting out the `ecm_install_po_files_as_qm(poqm)` line
+- Some have additional edits (kf6-kjobwidgets has 8 seds including
+  `find_package(Qt6GuiPrivate)` insertion, `KF6::Notifications`
+  commenting, etc.)
+- Generated by `migrate-kf6-seds-direct.sh`, then verified
+  manually-filtered to remove ECM-autogenerated noise
+  (`.clang-format`, `.gitignore`, `target/` artifacts)
+- Each patch is 1-2 hunks and <100 lines
+
+## Commits (C-7 arc, 2026-06-12)
+
+| Commit | Description |
+|---|---|
+| `b8c1c780d` | First C-7 patch (kf6-karchive) |
+| `bd3550840` | kf6-kwindowsystem C-7 patch + script ECM-noise exclude |
+| `07f924fe0` | migrate-kf6-seds: 600s timeout on per-recipe cook |
+| `86a80b2f1` | C-7 cleanup: 24 NO-OP KF6 recipes (full sed removal) |
+| `9a3c380e2` | test-cleanup-noop-seds: 9 unit tests |
+| `aa082b155` | C-7: complete 16/17 KF6 sed-to-patch migration |
+| `f981267aa` | C-7: 8 unclassified recipes migration + regen 2 |
+| `495c1c985` | C-7: 6 unclassified recipes targeted sed removal |
+| `963c2baba` | C-7 step 2: 24 recipes use cookbook_apply_patches |
+| `4243beb4a` | test-edit-kf6-recipes: 11 unit tests |
+| `e3e1faece` | test-cookbook-apply-patches-e2e: 4 integration tests |
+| `2357758ef` | postmortem: mark C-7 complete, C-8 ready |
+
+## What this enables
+
+- **Upstream syncs** (e.g. KF6 6.26.0 → 6.27.0): bump the
+  `tar` URL + `blake3` in the recipe, re-cook. The cookbook
+  helper re-applies the migration patch on the new upstream.
+  If the patch doesn't apply, you get a clear error message
+  in the cook log.
+- **`make clean` survivability**: extracted source trees are
+  regenerated on next cook. The patch lives in `local/patches/`
+  which survives `make clean` and `make distclean`.
+- **Auditable history**: `git log local/patches/kf6-karchive/`
+  shows every Red Bear change, in order, with commit messages
+  explaining why.
+- **Per-recipe rollback**: `rm -rf local/patches/<name>/`
+  reverts to upstream behavior. `git revert <commit>` rolls
+  back a specific change.
+- **Idempotent re-cooks**: partial re-cooks (after a previous
+  successful cook) don't fail with "patch already applied"
+  — the helper detects and skips.
+
+## Next steps (not C-7 anymore)
+
+1. **C-8**: Delete extracted `source/` trees (5.4 GB) and
+   `source.tar` files (74 × ~5 MB avg) that are not actively
+   being built. The `local/recipes/**/source/` and
+   `local/recipes/**/source.tar` patterns are already in
+   `.gitignore` so deleting them is safe; the cookbook re-
+   extracts on next fetch.
+
+2. **`make lint-recipe` cleanup**: 10 remaining errors for
+   non-KF6 recipes (bison, m4, rust-native, sddm,
+   qt6-wayland-smoke, libwayland, redbear-sessiond). Each
+   needs its own migration or in-tree fork decision.
+
+3. **Real cook verification**: cook one of the migrated
+   recipes (e.g. `kf6-karchive`) end-to-end and verify
+   `stage.pkgar` byte-identical to the inline-sed version.
+   This proves the migration preserves the exact build
+   artifact. Blocked on toolchain infrastructure issues
+   unrelated to C-7.