docs: prune stale planning docs and lean out agent guide

- Remove FEATURE_SPEC.md, TODO.md, and docs/AGENT_INTEGRATION.md; their
  core gaps have shipped. Open work moves to a short ROADMAP.md.
- Remove the CLAUDE.md symlink and rewrite AGENTS.md as a quick guide:
  navigation, rules, and the nix flake check gate.
- Merge OWNERSHIP_SELF_HOSTED.md into OWNERSHIP_PUBLISH.md and drop
  private host integration notes.
- ARCHITECTURE: add MSN endpoints, clarify Bing ingest is unsupported.
- OWNERSHIP_SYNC: note source.pdf_url also carries XLSX URLs.
- systemd example: --history 2 so snapshots stay under the 10 MiB
  client cap.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

ROADMAP.md

@@ -0,0 +1,33 @@
+# Roadmap
+
+Open work only. Shipped behavior is described in `README.md` and `docs/`;
+history lives in git.
+
+## Stocks
+- `market summary`: IHSG index and market breadth
+- `market movers`: top gainers, losers, and volume
+- `market sectors`: sector performance overview
+- `screen query "<EXPR>"`: filter stocks by expression
+- `screen presets` / `screen run <PRESET>`: built-in screener presets
+  (graduate `screen` out of `stocks` only if these grow into a richer workflow)
+- Multi-period financial statements (today `financials` is single-period)
+
+## Workflow
+- `watchlist`: named symbol sets usable by other commands
+- `alerts`: price alerts with a daemon
+- CSV/TSV and JSONL output
+- Stdin symbol input for chaining (`... | idx stocks fundamental --stdin`)
+- Additional providers (Alpha Vantage, Twelve Data, IDX official)
+
+## Agent integration
+- MCP server exposing the existing commands as tools (planned as `idx-mcp`)
+- JSON Schema export for command output
+- Composite `analyze` command (quote, fundamentals, ownership, sentiment)
+
+## Known limits
+- Yahoo can return `429` from datacenter IPs; requests retry with backoff but
+  can still fail.
+- `stocks technical` reports the SMA200 trend as unavailable when fewer than
+  200 daily candles are returned.
+- MSN history for IDX is price-only (`1mo`, `3mo`, `1y`); Yahoo stays the
+  default OHLCV source.