Release v0.18.3

Changes from 0.18.2 to 0.18.3

What's Changed

• feat: allow env to be shared by current directory by @4shub in #1355
• fix: preserve context window during resume preset refresh by @cpfiffer in #1353
• feat: file indexing by @shelleypham in #1352
• fix: update args fallback by @carenthomas in #1357
• feat: add strict to update args by @carenthomas in #1358
• feat: Make /init an interactive flow conducted by the primary agent [LET-7891] by @devanshrj in #1356
• fix: byok model fallback by @carenthomas in #1359
• Update reflection subagent prompts and use local transcript files for context by @sarahwooders in #1348
• feat: New letta.md system prompt + source-faithful benchmarking prompts [LET-7747, LET-7787] by @devanshrj in #1313
• fix(headless): support recover_pending_approvals in stream-json mode by @cpfiffer in #1361
• feat: persist working directory cache across restarts [LET-7949] by @4shub in #1364
• feat: colorize debug log screen output by @jnjpng in #1365
• feat: enable LETTA_DEBUG=1 by default in dev script by @jnjpng in #1366
• feat: speed up shallow init subagent [LET-7889] by @devanshrj in #1362
• chore: Remove agent-info shared reminder for subagents [LET-7974] by @devanshrj in #1368
• feat: add debug logs with error details on retry by @jnjpng in #1367
• feat: add dispatching-coding-agents bundled skill by @sarahwooders in #1166
• Shub/let 7883 add terminal support by @4shub in #1369
• feat: resume server-side run on pre-stream 409 conversation busy by @jnjpng in #1370
• chore: Add gpt 5 mini with high reasoning by @devanshrj in #1372
• fix: Disable memfs for newly spawned subagents [LET-7975] by @devanshrj in #1371

Full Changelog: v0.18.2...v0.18.3