[Bug] squad watch triage fails silently — wrong label slug + missing label pre-creation #784

Bug: squad watch triage fails silently — wrong label slug + missing label pre-creation

Symptoms

• squad watch shows 🔴 Untriaged: 1 but never assigns a squad:{member} label
• Issue stays untriaged forever across rounds
• In-session "Ralph, go" works fine for the same issue

Root Cause (reproduced with test repo)

Bug 1 — Wrong label slug. Watch triage derives the label from the agent's display name in team.md (e.g., "Steve Rogers" → squad:steve rogers) instead of the agent's directory slug (e.g., steve-rogers → squad:steve-rogers).

Bug 2 — No label pre-creation. gh issue edit --add-label "squad:steve-rogers" requires the label to already exist in the GitHub repo. If it doesn't exist, gh returns exit code 1 with error 'squad:steve-rogers' not found. Watch swallows this error and the issue stays untriaged.

Reproduction

# Create a squad with multi-word agent names (e.g., Marvel universe)
# team.md has: Steve Rogers, Tony Stark, Natasha Romanoff
# .squad/agents/ has: steve-rogers/, tony-stark/, natasha-romanoff/

# Create issue with squad label
gh issue create --title "Test" --label squad

# Run watch
squad watch --interval 1

# Watch shows Untriaged: 1 but never assigns
# Because it tries: gh issue edit --add-label "squad:steve rogers"
# Which fails: label doesn't exist + wrong slug format

Expected Behavior

1. Watch should derive label slugs from agent directory names (.squad/agents/{slug}/), not display names
2. Watch should pre-create missing squad:{member} labels on startup or before first assignment
3. Triage errors should be surfaced (at minimum in --verbose mode), not swallowed

Affected Code

• packages/squad-sdk/src/ralph/triage.ts — label slug derivation
• packages/squad-cli/src/cli/commands/watch/index.ts — triage error handling

Workaround

Manually create labels before running watch:

gh label create "squad:steve-rogers" --color d4c5f9
gh label create "squad:tony-stark" --color d4c5f9
# etc.

Related

• [Watch] Add --verbose flag for debugging empty board and silent failures #781 (--verbose flag would surface these errors)
• feat(watch): --verbose flag for debugging empty boards #782 (PR adding --verbose)