Unify dispatch rules and hooks into a flat rule registry, add structured event journal with causal tracing, expose journal query as an LLM tool, and adopt gsd_concept_action tool naming.
- RuleRegistry class absorbs dispatch rules + hooks into UnifiedRule objects with common when/where/then shape
- post-unit-hooks.ts refactored from 524 lines → 90-line thin facade delegating to the registry
- Event journal emits structured JSONL events with per-iteration flowId grouping and causedBy chains
- gsd_journal_query LLM-callable tool for AI self-debugging of autonomous runs
- 4 DB tools renamed to gsd_concept_action pattern with backward-compatible aliases
- 164 new tests, zero regressions
Closes#1763, closes#1764, closes#1766
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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