chore(vendor): import pi 1.3.0

Imported as a linear vendor commit so forge rebases do not replay the upstream root tree.

git-subtree-dir: third_party/pi

git-subtree-split: 71023aec1546d6d677a65669c5665c0927ce0dd0

third_party/pi/scripts/issues/README.md

@@ -0,0 +1,59 @@
+# Issue triage
+
+A local tool for the daily issue review. It runs in this order:
+
+1. **Sync.** Keeps a local copy of the repository's issues in `data/corpus.json` with `gh api`. The first run fetches the last 120 days; after that it syncs every 20 minutes and only fetches what changed.
+2. **Triage.** Each new issue gets its own conversation with a [pi-durable](../../packages/durable/README.md) agent. The agent:
+   - searches the local copy for duplicates and related issues (`search_issues`, `read_issue`)
+   - picks a category from `categories/*.md`
+   - writes a one-sentence summary and signals
+   - suggests p0, p1, or none
+3. **Review.** A web UI lists the inbox: every issue created since the inbox start, grouped by the agent's suggestion. You set p0, p1, or none, and fix the category if needed. Each issue links to GitHub.
+
+Decisions are stored locally only. Nothing is written to GitHub yet.
+
+All state lives in `data/` (gitignored):
+
+- `corpus.json`: the local copy of the issues
+- `triage.sqlite`: pi-durable storage with one conversation per triaged issue, the triage results, and your decisions in the `triage.state` document
+- `token`: the UI access token
+
+Restarting the server resumes any triage runs that were in flight.
+
+## Files
+
+- `categories/*.md`: one file per category. The file name is the category label. The frontmatter `owner` is the GitHub user who owns the category.
+- `prompt.md`: the triage procedure and priority guidance given to the agent.
+- `main.ts`: sync loop and HTTP server.
+- `triage.ts`: the durable triage agent.
+- `github.ts`: the local copy of the issues and keyword search.
+- `ui.html`: the web UI.
+- `source-hooks.mjs`, `register.mjs`: run workspace packages from source, so no build is needed.
+
+## Run
+
+```bash
+./scripts/issues/run.sh   # http://127.0.0.1:7788
+```
+
+Open `http://127.0.0.1:7788/?t=<token>` once, with the token from `scripts/issues/data/token`. The server then sets a cookie, so later visits don't need the token.
+
+The agent authenticates through `~/.pi/agent/auth.json`, the same credentials pi uses.
+
+| Variable | Default | |
+|---|---|---|
+| `TRIAGE_MODEL` | `openai-codex/gpt-5.6-sol` | `provider/model`. Supported providers: `openai-codex`, `anthropic`. |
+| `TRIAGE_THINKING` | `medium` | Thinking level |
+| `TRIAGE_CONCURRENCY` | `4` | Parallel triage runs |
+| `TRIAGE_INBOX_DAYS` | `2` | On the first run, the inbox starts this many days back |
+| `TRIAGE_CORPUS_DAYS` | `120` | On the first run, fetch issues updated in this many days |
+| `TRIAGE_SYNC_MINUTES` | `20` | Sync interval |
+| `TRIAGE_PORT` | `7788` | Local port |
+| `TRIAGE_SOCKET` | | Listen on this unix socket instead of the port, for a reverse proxy |
+| `TRIAGE_DATA` | `scripts/issues/data` | State directory |
+
+## UI keys
+
+- `j`/`k`: move between issues
+- `0`, `1`, `n`: set p0, p1, none
+- `o`: open the issue on GitHub