docs: add discrawl skill

.agents/skills/discrawl/SKILL.md

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+---
+name: discrawl
+description: Use for local Discord archive search, sync freshness, DMs, channel summaries, and Discrawl repo/release work.
+---
+
+# Discrawl
+
+Use local archive data first for Discord questions. Browse or hit live APIs only when the local archive is stale or the user asks for current external context.
+
+## Sources
+
+- DB: `~/.discrawl/discrawl.db`
+- Config: `~/.discrawl/config.toml`
+- Repo: `~/Projects/discrawl`
+- Preferred CLI: `discrawl`; fallback to repo binary if installed binary is stale
+
+## Freshness
+
+For recent/current questions, check freshness before analysis:
+
+```bash
+sqlite3 ~/.discrawl/discrawl.db \
+  "select coalesce(max(updated_at),'') from sync_state where scope like 'channel:%';"
+```
+
+Routine refresh:
+
+```bash
+discrawl doctor
+discrawl sync
+```
+
+Historical/backfill refresh:
+
+```bash
+discrawl sync --full
+```
+
+If SQLite reports busy/locked, check for stray `discrawl` processes before retrying.
+
+## Query Workflow
+
+1. Resolve scope: guild, channel, DM, author, keyword, date range.
+2. Check freshness for recent/current requests.
+3. Use CLI for normal reads; use SQL for precise counts/rankings.
+4. Report absolute date spans, counts, channel/DM names, and known gaps.
+
+Common commands:
+
+```bash
+discrawl search "query"
+discrawl messages --channel '#maintainers' --days 7 --all
+discrawl --json sql "select count(*) from messages;"
+```
+
+When the installed CLI lacks a new feature, build or run from `~/Projects/discrawl` before concluding the feature is missing.
+
+## Discord DMs
+
+Wiretap/Desktop cache DMs are local-only. Do not imply they are in the published Git snapshot. For missing recent DMs, refresh first; stale archive is a common cause.
+
+## Verification
+
+For repo edits, prefer existing Go gates:
+
+```bash
+go test ./...
+```
+
+Then run targeted CLI smoke for the touched surface, for example:
+
+```bash
+discrawl doctor
+discrawl search "test" --limit 5
+```