fix: Replace Codeberg dependency with local Forgejo instance (#611)

- Add setup_forge() to bin/disinto: provisions Forgejo via Docker,
  creates admin + bot users (dev-bot, review-bot), generates API
  tokens, creates repo, and pushes code — all automated
- Rename env vars: CODEBERG_TOKEN→FORGE_TOKEN, REVIEW_BOT_TOKEN→
  FORGE_REVIEW_TOKEN, CODEBERG_REPO→FORGE_REPO, CODEBERG_API→
  FORGE_API, CODEBERG_WEB→FORGE_WEB, CODEBERG_BOT_USERNAMES→
  FORGE_BOT_USERNAMES (with backwards-compat fallbacks)
- Rename API helpers: codeberg_api()→forge_api(), codeberg_api_all()
  →forge_api_all() (with compat aliases)
- Add forge_url field to project TOML; load-project.sh derives
  FORGE_API/FORGE_WEB from forge_url + repo
- Update parse_repo_slug() to accept any host URL, not just codeberg
- Forgejo data stored under ~/.disinto/forgejo/ (not in factory repo)
- Update all 58 files: agent scripts, formulas, docs, site HTML

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

supervisor/best-practices/review-agent.md

@@ -3,7 +3,7 @@
 ## Architecture
 - `review-poll.sh` (cron */10) → finds open PRs with CI pass + no review → spawns `review-pr.sh`
 - `review-pr.sh` uses `claude -p` to review the diff, posts structured comment
-- Uses `review_bot` Codeberg account for formal reviews (separate from main account)
+- Uses `review_bot` forge account for formal reviews (separate from main account)
 - Skips WIP/draft PRs (`[WIP]` in title or draft flag)
 
 ## Safe Fixes
@@ -27,4 +27,4 @@
 - Review bot must output JSON — prevents self-narration collapse
 - DISCUSS verdict should be treated same as REQUEST_CHANGES by dev-agent
 - Error comments must NOT include `<!-- reviewed: SHA -->` — would falsely mark as reviewed
-- Review bot uses Codeberg formal reviews API — branch protection requires different user than PR author
+- Review bot uses forge formal reviews API — branch protection requires different user than PR author