docs(spec): fill critical gaps for milestones v3.2.0–v3.7.0
Add missing spec sections identified during architecture review:
Critical gaps resolved:
- Add `agents plan guard` CLI command to synopsis and command reference
(v3.5.0 Deliverable 12 — was referenced but had no spec)
- Add `agents tui` and `agents tui web` CLI commands to synopsis and
command reference (v3.7.0 Deliverables 1, 18 — absent from CLI index)
- Add `### Merge Strategies` section with git three-way merge algorithm,
MergeWorkflow component, MergeResult/MergeConflict data models, and
conflict resolution UX (v3.3.0 Deliverables 5, 6)
- Add `### Autonomy Acceptance` section with formal acceptance criteria,
reference task specification, and Robot Framework acceptance test
(v3.5.0 Deliverable 10)
Moderate gaps resolved:
- Add `### Guard Enforcement` section with GuardEnforcer component,
guard evaluation order, guard sources, and violation behavior table
(v3.5.0 Deliverable 3)
- Add `### Event Queue` section with event types, event schema,
publish/subscribe API, and local vs. server mode behavior
(v3.5.0 Deliverable 2)
- Add `### TUI Materializer` section with ElementHandle→widget mapping,
TuiMaterializer interface, A2A integration, and thread safety
(v3.7.0 Deliverable 7)
- Add `### Provider Registry` section with built-in providers, custom
provider YAML, auto-discovery, and ProviderRegistry API
(v3.6.0 Deliverable 11)
- Add `### Testing Strategy — E2E` section with Robot Framework test
structure, required E2E coverage table, and shared keywords
(v3.6.0 Deliverable 15)
Minor fixes:
- Fix broken anchor links in milestone spec coverage references
- Update v3.2.0 spec coverage to point to actual section headings
- Update v3.4.0 context storage tiers anchor to match actual heading
- Add `agents tui` commands to `#### agents tui` command reference section
HAL9000
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