docs: remove agent-only scaffolding from the public repo

Someone reading the repo flagged the committed skill/agent folders. Fair — they
were build scaffolding for us, sitting in a directory strangers read.

Removed docs/superpowers/plans/ (4,127 lines). Four implementation plans for work
that shipped in v0.6/v0.7, written as task-by-task checklists addressed to
"agentic workers" and referencing sub-skills by name. Meaningless to anyone else,
and they made the docs directory look like a construction site.

Removed docs/agents/. domain.md was the worst of it: 35 lines describing how to
consume CONTEXT.md and docs/adr/, neither of which exists in this repo — a doc
pointing at nothing. issue-tracker.md and triage-labels.md were real but
redundant; CLAUDE.md already carried the label vocabulary inline, so the pointers
have been folded into a plain "Issues" section that also names the issue template.

Git history keeps all of it if we ever want to look back.

KEPT CLAUDE.md deliberately. It's a recognized convention rather than a leak, and
for this project it's the actual architecture reference — the numbering scheme,
the channels.json schema, the surgical-deploy invariants, the rules about never
delete-recreating a live channel. A contributor is better off with it than
without, and much of what it documents exists nowhere else.

348 tests still pass; nothing removed was referenced by code, docs, or the build.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Author: AlpineArchitecture

CLAUDE.md

@@ -464,16 +464,9 @@ intact. Live franchise channels carry `playback: interleaved` by default (see ch
 authoring UI and status cards), full rationale, rejected alternatives, and history:
 [`docs/live-channels-design.md`](docs/live-channels-design.md).
 
-## Agent skills
+## Issues
 
-### Issue tracker
-
-Issues are tracked in GitHub Issues (`AlpineArchitecture/programmarr`) via the `gh` CLI. See `docs/agents/issue-tracker.md`.
-
-### Triage labels
-
-Default vocabulary: `needs-triage`, `needs-info`, `ready-for-agent`, `ready-for-human`, `wontfix`. See `docs/agents/triage-labels.md`.
-
-### Domain docs
-
-Single-context — one `CONTEXT.md` + `docs/adr/` at the repo root. See `docs/agents/domain.md`.
+Tracked in GitHub Issues (`AlpineArchitecture/programmarr`) via the `gh` CLI. Label
+vocabulary: `needs-triage`, `needs-info`, `ready-for-agent`, `ready-for-human`, `wontfix`.
+Bug reports come in through `.github/ISSUE_TEMPLATE/`, which requires the Programmarr and
+Tunarr versions and the media-source type — the three fields that explain most reports.