# Worklog: callstack-diff-effect-v4

Status: complete

## Objective

Outcome: land the `callstack-diff` Effect 4 beta CLI rewrite and package-local
`@effect/tsgo` type-aware lint workflow without shipping dev tooling.

Done when: source and Nix-built `csd` render, report domain errors cleanly, and
diff revisions; focused tests, type-aware lint, package checks, and workflow
gates pass; scoped commits are on `origin/main`; unrelated dirt is untouched.

## Decisions

- Use `effect@4.0.0-beta.105` and `@effect/platform-bun@4.0.0-beta.105`, matching
  the successful paused-session spike.
- Keep the analyzer/tree/diff/renderer pure; use Effect at CLI, filesystem, and
  Git boundaries.
- Use the Effect 4 `effect/unstable/cli` and `effect/unstable/process` APIs. The
  standalone `@effect/cli` package and the published Platform Command page
  document the Effect 3 APIs, while the current Effect 4 skill matches the
  pinned beta declarations.
- Keep `@effect/tsgo`, oxlint, and oxlint-tsgolint dev-only. Patch local tooling
  explicitly with `bun run lint:setup`; do not run post-install scripts in Nix.
- Preserve `.agents/worklogs/audit-agent-worktrees.md` as unrelated user work.

## Evidence

- `hostname` and `uname -a`: `MacTraitor-Pro.local`, Darwin arm64.
- `jj root --ignore-working-copy`: no jj repository; this is the canonical Git
  checkout on `main`.
- `bun run src/cli.ts PiService.createAgentSession --root tests/fixtures/after
--theme none`: reproduced exit 1 with `TypeError: Effect.catchAll is not a
function`.
- Local Effect 4 exports `Effect.catch`, not `Effect.catchAll`.
- Bun types document strict `test.failing`: an unexpected pass fails the suite.
- Agent receipt: run `20260808T040037Z-0c7b31a9a7cb`, stored at
  `/Users/emiller/.local/state/dotfiles-agent-runs/53e298a49a4b/20260808T040037Z-0c7b31a9a7cb.json`.
- `bun run lint`: clean Effect-aware, type-aware oxlint result with warnings
  denied.
- `bun test`: 12 passing tests, including public render and Git diff commands.
- `nix build .#callstack-diff --no-link --print-out-paths`: built
  `/nix/store/1q3nc46jln86vkx3w0b1alimnknfwxnj-callstack-diff-0.1.0`.
- Built output checks: help, render, revision diff, and clean missing-entry error
  passed; no `@effect/tsgo` or oxlint path exists in the runtime `node_modules`.
- Focused agent-quality test and `ast-grep scan packages/callstack-diff` passed.
- `hey check --worktree packages/callstack-diff flake.nix
tests/test_agent_quality.py`: all Darwin checks passed.
- `hey agent-audit-tests ...`: `PASS test-confidence`.
- After the unrelated OMP owner published its equivalent commit, `git rebase
origin/main` skipped the duplicate OMP patch and replayed only the three task
  commits. All focused checks passed again at the rebased tip.
- Initial landing proof: local `main`, `origin/main`, and the authoritative
  remote ref all equaled `4005bfc5ffb13e38bddaa58c2733058d084445ad`.

## Reviews

No cross-model review requested.

## Feedback

The resumed Droid transcript was available as JSONL even though the TUI hid 275
compacted messages; the compaction state retained the precise cutoff and failed
runtime command.

`hey agent-finish --worklog ...` incorrectly included every untracked worklog,
formatted the unrelated 1.2 MB audit worklog, and then failed its size gate. The
audit file was restored byte-for-byte from two matching checkout copies; its
restored SHA-256 is
`8cd019032c77a74492d72af343909bc8e70e63a462d019bd0c227c9a7d7ff5b4`.

## Remaining work

None.

## Commits

- `ddad5aa94` — `test(csd): capture Effect CLI runtime failure`
- `40b90d201` — `fix(quality): isolate package-local oxlint configs`
- `4005bfc5f` — `refactor(csd): move CLI and process IO to Effect 4`
- This final worklog commit records the completed landing proof.
