docs: update docs for cron, shortener, CI

Add !cron section to USAGE.md and CHEATSHEET.md.
Mark cron, URL shortener, CI complete in ROADMAP.md and TODO.md.
New sprint in TASKS.md.

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

docs/CHEATSHEET.md

@@ -437,6 +437,18 @@ History in `data/alert_history.db`.
 
 Shows top 3 results as `Title -- URL`. Channel only. Max query length: 200 chars.
 
+## Cron (admin)
+
+```
+!cron add 1h #ops !rss check news   # Schedule command every hour
+!cron add 2d #alerts !tor update    # Every 2 days
+!cron del abc123                    # Remove job by ID
+!cron list                          # List jobs in channel
+```
+
+Intervals: `5m`, `1h30m`, `2d`, `90s`, or raw seconds. Min 1m, max 7d.
+Max 20 jobs/channel. Persists across restarts. Channel only.
+
 ## Plugin Template
 
 ```python

docs/USAGE.md

@@ -141,6 +141,7 @@ format = "text"               # Log format: "text" (default) or "json"
 | `!shorten <url>` | Shorten a URL via FlaskPaste |
 | `!paste <text>` | Create a paste via FlaskPaste |
 | `!pastemoni <add\|del\|list\|check>` | Paste site keyword monitoring |
+| `!cron <add\|del\|list>` | Scheduled command execution (admin) |
 
 ### Command Shorthand
 
@@ -1077,6 +1078,42 @@ badhost.invalid -> NXDOMAIN
 - Concurrent via `asyncio.gather()`
 - Valid types: A, NS, CNAME, SOA, PTR, MX, TXT, AAAA
 
+### `!cron` -- Scheduled Command Execution
+
+Schedule bot commands to repeat on a timer. Admins only.
+
+```
+!cron add <interval> <#channel> <command...>   Schedule a command
+!cron del <id>                                 Remove a job
+!cron list                                     List jobs in channel
+```
+
+Examples:
+
+```
+!cron add 1h #ops !rss check news      Poll RSS feed every hour
+!cron add 2d #alerts !tor update       Update Tor list every 2 days
+!cron del abc123                       Remove job by ID
+!cron list                             Show jobs in current channel
+```
+
+Output format:
+
+```
+Cron #a1b2c3: !rss check news every 1h in #ops
+#a1b2c3 every 1h: !rss check news
+```
+
+- `add` and `del` require admin privileges
+- `add` and `list` must be used in a channel (not PM)
+- Interval formats: `5m`, `1h30m`, `2d`, `90s`, or raw seconds
+- Minimum interval: 1 minute
+- Maximum interval: 7 days
+- Maximum 20 jobs per channel
+- Jobs persist across bot restarts via `bot.state`
+- Dispatched commands run with the original creator's identity
+- The scheduled command goes through normal command routing and permissions
+
 ### FlaskPaste Configuration
 
 ```toml