chore(renovate): hand-migrate docker key, track gitea/runner, keep range lower bounds

- Replace the deprecated top-level `docker` key with the packageRule Renovate's
  own migration produced (matchCategories docker, enabled true), keeping every
  comment. Supersedes #139, which dropped all comment lines.
- Add gitea/runner (act_runner's upstream rename) to the blast-radius rule.
- rangeStrategy bump for flux/helm `>=A <B` ranges: the default `auto` resolves
  to `replace`, which turned `>=1.12.0 <1.13.0` into `<1.14.0` (#131, #130,
  #115). In-range `bump` updates are disabled; Flux adopts those unaided.
- Restore headlamp's lower bound: `<0.47.0` -> `>=0.46.0 <0.47.0` (live 0.46.0).

Co-Authored-By: Claude Opus 5.5 <[email protected]>

decisions/2026-11-08-renovate-config-cleanup.md

@@ -0,0 +1,65 @@
+---
+date: 2026-11-08
+branch: chore/renovate-config-cleanup
+title: Renovate config — hand-migrate the docker key, track gitea/runner, keep HelmRelease range lower bounds
+---
+
+## What changed
+
+- **`renovate.json5`: the deprecated top-level `"docker": {"enabled": true}` is hand-migrated** to
+  `packageRules[0] = {"matchCategories": ["docker"], "enabled": true}`, the exact shape Renovate's
+  own migration produced on `origin/renovate/migrate-config` (PR #139). Its comment moved with it.
+  This replaces #139, which was closed because its rewrite deleted every comment in the file. No
+  other comment was removed or reflowed (diff is additions plus the moved block).
+- **`gitea/runner` added to the blast-radius rule** beside `gitea/act_runner`, with a comment:
+  act_runner was renamed upstream to gitea/runner after 0.6.1; Renovate does not follow renames,
+  so the actual image migration is a separate manual PR.
+- **Two new packageRules for flux/helm `>=A <B` ranges:** `rangeStrategy: "bump"`, plus
+  `matchUpdateTypes: ["bump"] -> enabled: false`, so in-range releases (which Flux adopts on its
+  own) do not become PRs. Cause of the bug, from the 44.167.0 source: rangeStrategy is unset
+  (`auto`); the flux manager has no `getRangeStrategy`/`updateLockedDependency`, so
+  `lib/modules/manager/index.ts getRangeStrategy` resolves `auto` to `replace`; helm versioning is
+  the npm api verbatim, and npm `getNewValue` under `replace` turns `>=1.12.0 <1.13.0` into
+  `<1.14.0` (what PRs #131, #130 and #115 did).
+- **`platform/headlamp/helmrelease.yaml`: `version: "<0.47.0"` -> `">=0.46.0 <0.47.0"`**, comment
+  refreshed. The live chart is 0.46.0, so the set of installable charts is unchanged.
+
+## What I verified
+
+- **Semantic diff of #139:** I parsed `renovate.json5` on `origin/renovate/migrate-config` and on its
+  parent `5b484f6` with json5 (the copy inside the renovate image). With `docker` removed from the
+  parent and `packageRules[0]` removed from the migrated file, the two are identical. So the only
+  change was `{"matchCategories":["docker"],"enabled":true}`, inserted at packageRules[0].
+- **Validator, `ghcr.io/renovatebot/renovate:44.167.0`** (the tag that `.gitea/workflows/renovate.yaml`
+  pins as `container.image`): `renovate-config-validator` gives `Config validated successfully`
+  (rc 0), and so does `--strict` (rc 0), both as a file path and in repo mode. **`--strict` on
+  origin/main's file gives rc 1** and prints the `docker` migration diff. Nothing is left to migrate.
+- **`getNewValue` called in the 44.167.0 image** (helm versioning), currentValue
+  `>=1.12.0 <1.13.0`, newVersion 1.13.0: replace `<1.14.0`, widen `>=1.12.0 <1.14.0`,
+  bump `>=1.13.0 <1.14.0`, pin/update-lockfile `<1.14.0`. On `<0.47.0`, bump returns the value
+  unchanged, so it would never propose anything for that range. That is why the rule is scoped to
+  the `>=A <B` shape.
+- **Local dry run** (`--platform=local`, `RENOVATE_DRY_RUN=lookup`, 44.167.0, live chart repos)
+  against a fixture repo of four HelmReleases under `platform/`:
+  - With this branch's config: `No config migration necessary`. longhorn `>=1.9.0 <1.10.0` ->
+    `>=1.13.0 <1.14.0` (minor). kube-prometheus-stack `>=88.0.0 <89.0.0` -> `>=93.1.0 <94.0.0`
+    (major). The in-range bump `>=88.6.5 <89.0.0` was dropped (`Filtered out 1 disabled update(s)`).
+    headlamp `>=0.46.0 <0.47.0` and `<0.47.0`: no update.
+  - Control run with origin/main's config: `Config migration necessary`, longhorn -> `<1.14.0`,
+    kube-prometheus-stack -> `<94.0.0`. This reproduces the reported bug.
+- Live headlamp HelmRelease (read-only kubectl, k3s-prod): spec `<0.47.0`, history chartVersion
+  `0.46.0`, Ready `True`.
+
+## What I did NOT verify
+
+- **I have not seen a real scheduled Renovate run against this repo with this config.** The claim that
+  Renovate stops reopening the migrate-config PR rests on the validator and on `No config migration
+  necessary` in the local dry run, not on the Gitea bot. After merge, watch the next run, and if
+  `renovate/migrate-config` is still on the remote, delete it.
+- **Under bump, the new lower bound is the release Renovate proposes**, e.g. `>=1.13.2 <1.14.0`, not
+  `>=1.13.0`. Flux still installs the newest release in the window. Ranges with other shapes keep the
+  default `replace`: `3.9.x`, `~`, ceiling-only, and exact pins.
+- **The open PRs #131, #115 and any others still carry unbounded `<X` values.** They were generated
+  under the old strategy, and Renovate should rebase or regenerate them under bump on its next run.
+  I have not checked that it does.
+- The gitea/runner rename itself (a new image reference and any config changes) is not done here.