feat: cross-user KV share grants and handles (PUT-1686)

[Salazareo]

Stacked on DS/put-1685 — review only this PR's diff; merges bottom-up.

[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	93.8% ⬆️ +0.01%	28465 / 30345
🔵	Statements	91.83% ⬇️ -0.01%	30891 / 33637
🔵	Functions	90.3% ⬆️ +0.06%	5187 / 5744
🔵	Branches	80.74% 🟰 ±0%	20521 / 25414

File Coverage

File	Stmts	Branches	Functions	Lines	Uncovered Lines
Changed Files
src/backend/types.ts	100% 🟰 ±0%	100% 🟰 ±0%	100% 🟰 ±0%	100% 🟰 ±0%
src/backend/clients/database/SqliteDatabaseClient.ts	89.14% 🟰 ±0%	57.45% 🟰 ±0%	81.6% 🟰 ±0%	95.58% 🟰 ±0%	6, 9, 13, 16, 24-26, 32, 33, 34, 38-39, 44, 45, 46, 47, 48, 243-245, 493-496, 511
src/backend/controllers/auth/AuthController.ts	90.79% ⬆️ +0.01%	79.25% 🟰 ±0%	77.96% ⬆️ +0.19%	91.73% 🟰 ±0%	6, 24-26, 32, 33, 34, 38-39, 44, 45, 47, 475-477, 491-493, 621-622, 696-698, 715-717, 859, 921-925, 943, 985-990, 999, 1010, 1025-1030, 1036, 1080-1081, 1084-1089, 1232, 1263-1264, 1283-1287, 1325-1327, 1329-1331, 1379, 1407-1418, 1493-1495, 1508, 1568-1570, 1604, 1617-1619, 1645-1647, 1678, 1682-1684, 1782, 1868, 1927, 1972, 2031, 2044-2047, 2089-2091, 2109-2112, 2166-2168, 2180-2182, 2198-2200, 2214-2217, 2223, 2242, 2253, 2374-2378, 2407, 2438-2440, 2452-2458, 2518-2523, 2602-2604, 2667, 2705, 2746-2748, 2814, 2844, 2923-2925, 2927-2929, 2933-2936, 2949-2952, 3017-3022, 3025-3027, 3054, 3073, 3091, 3109, 3122, 3145, 3157, 3174, 3184, 3195, 3249, 3382-3386, 3408-3410, 3424, 3427-3431, 3507
src/backend/controllers/events/EventsController.ts	84.12% ⬇️ -1.24%	49.65% 🟰 ±0%	64.86% ⬇️ -1.80%	90.32% ⬇️ -1.90%	6, 24-26, 32, 33, 34, 38-39, 44, 45, 47, 150-153, 192-194, 200-202
src/backend/controllers/events/limits.ts	100% 🟰 ±0%	100% 🟰 ±0%	100% 🟰 ±0%	100% 🟰 ±0%
src/backend/services/events/EventsService.ts	88.13% ⬇️ -0.18%	81.78% ⬇️ -0.82%	92% ⬆️ +0.46%	93.7% ⬆️ +0.04%	693-696, 776, 827, 845-848, 874-877, 883, 889, 902-905, 923, 986, 1005, 1013, 1099, 1123, 1131, 1139, 1150, 1180, 1182, 1201-1202, 1217, 1253, 1255, 1260, 1281, 1283, 1305, 1383, 1387-1388, 1404, 1409, 1443, 1446, 1519, 1524, 1551, 1553, 1557, 1564, 1623-1626, 1628-1631, 1636-1639, 1674, 1697, 1698, 1701, 1748-1751, 1756-1759, 1784, 1812, 1830-1834, 1866-1870, 1901, 1916, 1928, 1944, 1963, 1976, 2003, 2011, 2035, 2041, 2064, 2066, 2071, 2081, 2092, 2098, 2181, 2206, 2218-2222, 2240-2241, 2259, 2304-2306, 2341, 2413, 2421-2422, 2451, 2519, 2540, 2563, 2593, 2596, 2597, 2602, 2627, 2660, 2663, 2665, 2692, 2698, 2847, 2862, 2918, 2995, 3021, 3030, 3041, 3047, 3090-3091, 3095, 3178, 3184, 3234, 3245, 3247, 3263, 3296-3303, 3331-3335, 3357, 3365, 3373, 3383, 3476-3479, 3540, 3617, 3677-3681, 3740, 3751-3756, 3853, 3876, 3890, 3904, 3949, 3952, 3962, 3975, 3988-3989, 4017, 4050, 4059-4060, 4169, 4226-4228, 4239-4242, 4260-4261, 4271-4272
src/backend/services/events/anchors.ts	90.47% ⬇️ -1.42%	83.33% ⬇️ -1.96%	100% 🟰 ±0%	92.3% ⬇️ -1.81%	148, 173-175, 217-219, 282-284
src/backend/services/events/authorization.ts	90.9% ⬇️ -2.52%	86.95% ⬇️ -3.52%	100% 🟰 ±0%	96% ⬇️ -0.92%	136, 139, 207, 255, 257, 297, 301, 398
src/backend/services/events/kvShares.ts	96.82%	94.73%	100%	98.21%	143, 210
src/backend/services/events/subjects.ts	99.27% ⬆️ +0.14%	97.16% ⬆️ +0.65%	100% 🟰 ±0%	100% 🟰 ±0%	128
src/backend/stores/index.ts	100% 🟰 ±0%	100% 🟰 ±0%	100% 🟰 ±0%	100% 🟰 ±0%
src/backend/stores/events/DurableSubscriptionStore.ts	95.02% 🟰 ±0%	87.15% 🟰 ±0%	93.18% 🟰 ±0%	97.04% 🟰 ±0%	210, 214, 364, 405, 424, 695-700, 729-742
src/backend/stores/events/KvShareHandleStore.ts	100%	62.5%	100%	100%
src/backend/stores/events/types.ts	100% 🟰 ±0%	100% 🟰 ±0%	100% 🟰 ±0%	100% 🟰 ±0%
src/backend/stores/systemKv/SystemKVStore.ts	95.88% 🟰 ±0%	83.94% 🟰 ±0%	98.3% 🟰 ±0%	97.43% 🟰 ±0%	103, 129-131, 175, 184, 185, 225, 263, 279-280, 300-305, 318, 329, 354-357, 390, 431, 433-434, 466, 470, 522, 560, 977, 1053-1055, 1075, 1219, 1352, 1367

Generated in workflow #1510 for commit 56cc271 by the Vitest Coverage Report Action