# Agent Session: codex-task105-sliceb-20260222T195423Z-w8n3

- alias: `codex-task105-sliceb`
- mission: `Implement TASK-105 slice B runtime cast removal in targeted main/runtime modules without commit.`
- status: `done`
- started_utc: `2026-02-22T19:54:23Z`
- last_update_utc: `2026-02-22T20:02:06Z`

## Intent

- Remove unsafe non-test casts in requested runtime modules using strict shared contracts.
- Keep behavior unchanged; limit scope to type-safety and minimal fallout tests.
- Run targeted tests for changed modules and report outputs.

## Planned Files

- `src/main/runtime/app-runtime-main-deps.ts`
- `src/main/runtime/cli-command-context-main-deps.ts`
- `src/main/runtime/subtitle-tokenization-main-deps.ts`
- `src/main/runtime/overlay-runtime-options-main-deps.ts`
- `src/main/runtime/dictionary-runtime-main-deps.ts`
- `src/main/runtime/mpv-jellyfin-defaults.ts`
- `src/main/runtime/jellyfin-playback-launch.ts`
- `src/main/runtime/cli-command-context-main-deps.test.ts`
- `src/main/runtime/subtitle-tokenization-main-deps.test.ts`
- `src/main/runtime/mpv-jellyfin-defaults.test.ts`
- `src/main/runtime/mpv-jellyfin-defaults-main-deps.test.ts`
- `src/main/runtime/jellyfin-playback-launch.test.ts`
- `src/main/runtime/jellyfin-playback-launch-main-deps.test.ts`
- `src/main/runtime/**/*.test.ts`

## Files Touched

- `docs/subagents/INDEX.md`
- `docs/subagents/agents/codex-task105-sliceb-20260222T195423Z-w8n3.md`
- `docs/subagents/collaboration.md`
- `src/main/runtime/app-runtime-main-deps.ts`
- `src/main/runtime/cli-command-context-main-deps.ts`
- `src/main/runtime/subtitle-tokenization-main-deps.ts`
- `src/main/runtime/overlay-runtime-options-main-deps.ts`
- `src/main/runtime/mpv-jellyfin-defaults.ts`
- `src/main/runtime/jellyfin-playback-launch.ts`

## Assumptions

- Existing runtime contract types already cover needed dependency boundaries.
- Requested slice B is limited to listed files plus minimal typing-test fallout.

## Phase Log

- `2026-02-22T19:54:23Z` Session started; loaded backlog workflow + task context + subagent docs; preparing cast hotspot edits.
- `2026-02-22T19:59:42Z` Completed slice B edits: removed unsafe casts in targeted runtime modules, tightened contracts to shared runtime types, and ran targeted runtime tests (16 pass / 0 fail).
- `2026-02-22T20:02:06Z` Updated focused tests for stricter contracts (typed stubs/status snapshots) and re-ran targeted suite (16 pass / 0 fail).

## Next Step

- Handoff ready.