feat(omo-codex): add post-compact rule budget to codex hook

Trim rule and result char budgets after compaction via new
postCompactMaxRuleChars/postCompactMaxResultChars config, applied
through withPostCompactBudget. Extract codex-hook helpers into
dynamic-target-fingerprints, hook-output, path-utils,
rules-engine-factory, and transcript-rule-filter modules.

packages/omo-codex/plugin/components/rules/src/post-compact-budget.ts

@@ -0,0 +1,9 @@
+import type { PiRulesConfig } from "./rules/types.js";
+
+export function withPostCompactBudget(config: PiRulesConfig): PiRulesConfig {
+	return {
+		...config,
+		maxRuleChars: Math.min(config.maxRuleChars, config.postCompactMaxRuleChars),
+		maxResultChars: Math.min(config.maxResultChars, config.postCompactMaxResultChars),
+	};
+}