fix(core): dedup session.prs on parse + dedup writes + cleanup migration for indexed enrichment keys

[AgentWrapper]

Summary

• Deduplicate session.prs by owner/repo/number when rehydrating metadata.
• Deduplicate PR writes in lifecycle polling and use unique PR arrays for indexed enrichment/review metadata.
• Add startup cleanup for existing duplicated prs CSV data and stale prEnrichment_N / prReviewComments_N keys with a metadata.deduplicated activity event.

Tests

• pnpm --filter @aoagents/ao-core test
• pnpm typecheck (note: first run before pnpm build failed because tracker-gitlab could not resolve @aoagents/ao-plugin-scm-gitlab/glab-utils from missing dist; passed after build generated dist)
• pnpm lint (passes with existing warnings)
• pnpm build
• PORT=3100 DIRECT_TERMINAL_PORT=14901 pnpm dev + curl -I http://localhost:3100 -> 200 OK (default ports 3000/14801 were already in use)

[github-actions]

Test Coverage Report

Metric	Value
Lines covered	2137/2341
Lines not covered	204/2341
Overall coverage	91.3%

Per-file breakdown

File	Coverage
packages/core/src/lifecycle-manager.ts	918/1001 (91.7%)
packages/core/src/session-manager.ts	1153/1269 (90.8%)
packages/core/src/utils/pr.ts	48/51 (94.1%)
packages/core/src/utils/session-from-metadata.ts	18/20 (90.0%)

Uncovered lines

• packages/core/src/lifecycle-manager.ts: L101, L105, L107, L154, L173, L200, L214, L277, L364, L366, L618-L619, L629, L635-L636, L652, L665-L666, L840-L842, L874, L896, L910, L955, L1028, L1116-L1117, L1121, L1124-L1125, L1128, L1194, L1212-L1213, L1229-L1230, L1430-L1433, L1448, L1480, L1626-L1628, L1740, L1779-L1780, L1794-L1795, L1803, L1812, L1924, L1963, L1992-L1993, L1996, L2001, L2007, L2128-L2130, L2165-L2167, L2271, L2313-L2314, L2375-L2376, L2387, L2390, L2473-L2475, L3020, L3145, L3150, L3156, L3161, L3192, L3202
• packages/core/src/session-manager.ts: L308, L317-L318, L323-L324, L326, L339, L450, L514-L515, L517, L664, L729, L800-L802, L929-L930, L933, L1018, L1097, L1101, L1103, L1131, L1203-L1205, L1336, L1392, L1471, L1592, L1596-L1597, L1717, L1849, L1862-L1863, L1871, L1884-L1885, L1908, L1921-L1922, L1948, L2075, L2079-L2080, L2137, L2143, L2154, L2181, L2186, L2198, L2213-L2214, L2221, L2240, L2252, L2277, L2406, L2509-L2511, L2582, L2678, L2704-L2705, L2761-L2762, L2766, L2804-L2805, L2817-L2818, L2822, L2834, L2886, L2891, L2898, L2907, L2931, L2940, L2971, L2981, L2987, L3012, L3045, L3067, L3074, L3080, L3092, L3143, L3145-L3147, L3149, L3152-L3155, L3157-L3158, L3160, L3190, L3199, L3207, L3240, L3267, L3312, L3316, L3340, L3425, L3428, L3485, L3515, L3612
• packages/core/src/utils/pr.ts: L49, L68, L107
• packages/core/src/utils/session-from-metadata.ts: L31, L38