Add progress data to builder overview

[waleedkadous]

Parent: #323

Task

Enhance builder overview API to include progress percentage, plan phase tracking, and blocked state.

Enhance parseStatusYaml() to also extract:

• planPhases: Array<{ id: string; title: string; status: string }> — from plan_phases: YAML block
• protocol: string — already parsed

Enhance BuilderOverview interface with new fields:

export interface BuilderOverview {
 // ... existing fields ...
 protocol: string;
 planPhases: Array<{ id: string; title: string; status: string }>;
 progress: number; // 0-100 percentage
 blocked: string | null; // null or gate name: "spec review", "plan review", "PR review"
}

Add calculateProgress() function:

SPIR has 4 phases: specify → plan → implement → review → complete

phase value	Base %	Sub-progress
specify	0-25%	If gate pending+requested → stuck at 20%
plan	25-50%	If gate pending+requested → stuck at 45%
implement	50-90%	50% + (completed_plan_phases / total_plan_phases) × 40%
review	90-100%	If gate pending+requested → stuck at 95%
complete	100%	Done

Blocked detection:

• Check each gate: if status === 'pending' → check if requested_at exists
• If requested but not approved → blocked on that gate
• Map gate names: spec-approval → "spec review", plan-approval → "plan review", pr-ready → "PR review"

Dependencies

Depends on #326 (fix discoverBuilders — needs correct project matching first)

[waleedkadous]

On it! Working on a fix now.