feat(open): create open variant SKILL.md and reference files

Router SKILL.md dispatches to mode-specific references:
- research.md: one-shot research with --store for persistence
- watchlist.md: add/remove/list/run topics
- briefing.md: daily/weekly briefing generation
- history.md: query/search accumulated findings
- context.md: agent memory template

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

variants/open/references/watchlist.md

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+# Watchlist Management
+
+Manage topics you want to track continuously. Findings accumulate in the SQLite database for briefings and history queries.
+
+## Commands
+
+| Command | Action |
+|---|---|
+| `watch add "topic"` | Add a topic (daily schedule) |
+| `watch add "topic" --weekly` | Add with weekly schedule |
+| `watch "topic"` | Shorthand for `watch add` |
+| `watch remove "topic"` | Remove a topic |
+| `watch list` | Show all topics with status |
+| `watch config delivery [channel]` | Set delivery channel |
+| `watch config budget AMOUNT` | Set daily cost budget |
+| `watch run-all` | Run research for all topics now |
+| `watch run-one "topic"` | Run research for one topic now |
+
+## Adding a Topic
+
+```bash
+python3 "${SKILL_ROOT}/scripts/watchlist.py" add "TOPIC_NAME" [--weekly] [--queries "q1,q2"]
+```
+
+The script auto-bootstraps the SQLite database on first add.
+
+**Default schedule**: Daily at 8am (`0 8 * * *`).
+**Weekly**: Mondays at 8am (`0 8 * * 1`).
+
+**After adding**, confirm to the user:
+```
+Added "TOPIC_NAME" to watchlist.
+Schedule: daily at 8am (or weekly on Mondays)
+
+To run research now: /last30days watch run-one "TOPIC_NAME"
+To set up automated runs: add a cron/launchd job for `python3 ${SKILL_ROOT}/scripts/watchlist.py run-all`
+```
+
+## Removing a Topic
+
+```bash
+python3 "${SKILL_ROOT}/scripts/watchlist.py" remove "TOPIC_NAME"
+```
+
+Show confirmation or "not found" message.
+
+## Listing Topics
+
+```bash
+python3 "${SKILL_ROOT}/scripts/watchlist.py" list
+```
+
+Display as a formatted table:
+```
+Topic         | Schedule     | Last Run     | Findings | Status
+--------------+--------------+--------------+----------+--------
+AI video      | daily 8am    | 2h ago       | 47       | ok
+NVIDIA news   | weekly Mon   | 3d ago       | 23       | ok
+
+Budget: $0.42 / $5.00 today
+```
+
+## Running Research
+
+```bash
+# All enabled topics (with budget guard)
+python3 "${SKILL_ROOT}/scripts/watchlist.py" run-all
+
+# Single topic
+python3 "${SKILL_ROOT}/scripts/watchlist.py" run-one "TOPIC_NAME"
+```
+
+Show results: new findings count, updated findings, duration, and any errors.
+
+## Configuration
+
+```bash
+# Set delivery channel (for future notification support)
+python3 "${SKILL_ROOT}/scripts/watchlist.py" config delivery telegram
+
+# Set daily budget limit
+python3 "${SKILL_ROOT}/scripts/watchlist.py" config budget 10.00
+```
+
+## Scheduling
+
+The watchlist doesn't auto-schedule. To automate, set up a system job:
+
+**macOS (launchd)**:
+```bash
+# Run daily at 8am
+crontab -e
+# Add: 0 8 * * * python3 /path/to/scripts/watchlist.py run-all
+```
+
+**Linux (cron)**:
+```bash
+crontab -e
+# Add: 0 8 * * * python3 /path/to/scripts/watchlist.py run-all
+```
+
+## Error Handling
+
+- Duplicate topic: update the existing schedule
+- Topic not found on remove: show "not found" message
+- Budget exceeded: skip remaining topics, show which were skipped
+- Research failure: record error, continue to next topic