feat(skills): Add 'Use when / Don't use when' routing blocks (#14521)

* feat(skills): add 'Use when / Don't use when' blocks to skill descriptions

Based on OpenAI's Shell + Skills + Compaction best practices article.

Key changes:
- Added clear routing logic to skill descriptions
- Added negative examples to prevent misfires
- Added templates/examples to github skill
- Included Blake's specific setup notes for openhue

Skills updated:
- apple-reminders: Clarify vs Clawdbot cron
- github: Clarify vs local git operations
- imsg: Clarify vs other messaging channels
- openhue: Add device inventory, room layout
- tmux: Clarify vs exec tool
- weather: Add location defaults, format codes

Reference: https://developers.openai.com/blog/skills-shell-tips

* fix(skills): restore metadata and generic CLI examples

---------

Co-authored-by: Peter Steinberger <steipete@gmail.com>

skills/weather/SKILL.md

@@ -5,50 +5,108 @@ homepage: https://wttr.in/:help
 metadata: { "openclaw": { "emoji": "🌤️", "requires": { "bins": ["curl"] } } }
 ---
 
-# Weather
+# Weather Skill
 
-Two free services, no API keys needed.
+Get current weather conditions and forecasts.
 
-## wttr.in (primary)
+## When to Use
 
-Quick one-liner:
+✅ **USE this skill when:**
+
+- "What's the weather?"
+- "Will it rain today/tomorrow?"
+- "Temperature in [city]"
+- "Weather forecast for the week"
+- Travel planning weather checks
+
+## When NOT to Use
+
+❌ **DON'T use this skill when:**
+
+- Historical weather data → use weather archives/APIs
+- Climate analysis or trends → use specialized data sources
+- Hyper-local microclimate data → use local sensors
+- Severe weather alerts → check official NWS sources
+- Aviation/marine weather → use specialized services (METAR, etc.)
+
+## Location
+
+Always include a city, region, or airport code in weather queries.
+
+## Commands
+
+### Current Weather
 
 ```bash
-curl -s "wttr.in/London?format=3"
-# Output: London: ⛅️ +8°C
+# One-line summary
+curl "wttr.in/London?format=3"
+
+# Detailed current conditions
+curl "wttr.in/London?0"
+
+# Specific city
+curl "wttr.in/New+York?format=3"
 ```
 
-Compact format:
+### Forecasts
 
 ```bash
-curl -s "wttr.in/London?format=%l:+%c+%t+%h+%w"
-# Output: London: ⛅️ +8°C 71% ↙5km/h
+# 3-day forecast
+curl "wttr.in/London"
+
+# Week forecast
+curl "wttr.in/London?format=v2"
+
+# Specific day (0=today, 1=tomorrow, 2=day after)
+curl "wttr.in/London?1"
 ```
 
-Full forecast:
+### Format Options
 
 ```bash
-curl -s "wttr.in/London?T"
+# One-liner
+curl "wttr.in/London?format=%l:+%c+%t+%w"
+
+# JSON output
+curl "wttr.in/London?format=j1"
+
+# PNG image
+curl "wttr.in/London.png"
 ```
 
-Format codes: `%c` condition · `%t` temp · `%h` humidity · `%w` wind · `%l` location · `%m` moon
+### Format Codes
 
-Tips:
+- `%c` — Weather condition emoji
+- `%t` — Temperature
+- `%f` — "Feels like"
+- `%w` — Wind
+- `%h` — Humidity
+- `%p` — Precipitation
+- `%l` — Location
 
-- URL-encode spaces: `wttr.in/New+York`
-- Airport codes: `wttr.in/JFK`
-- Units: `?m` (metric) `?u` (USCS)
-- Today only: `?1` · Current only: `?0`
-- PNG: `curl -s "wttr.in/Berlin.png" -o /tmp/weather.png`
+## Quick Responses
 
-## Open-Meteo (fallback, JSON)
-
-Free, no key, good for programmatic use:
+**"What's the weather?"**
 
 ```bash
-curl -s "https://api.open-meteo.com/v1/forecast?latitude=51.5&longitude=-0.12&current_weather=true"
+curl -s "wttr.in/London?format=%l:+%c+%t+(feels+like+%f),+%w+wind,+%h+humidity"
 ```
 
-Find coordinates for a city, then query. Returns JSON with temp, windspeed, weathercode.
+**"Will it rain?"**
 
-Docs: https://open-meteo.com/en/docs
+```bash
+curl -s "wttr.in/London?format=%l:+%c+%p"
+```
+
+**"Weekend forecast"**
+
+```bash
+curl "wttr.in/London?format=v2"
+```
+
+## Notes
+
+- No API key needed (uses wttr.in)
+- Rate limited; don't spam requests
+- Works for most global cities
+- Supports airport codes: `curl wttr.in/ORD`