Checkpoints v2: Support compact transcript for factorydroid and codex

[computermode]

Support converting full.jsonl to transcript.jsonl for factory droid and codex agents.

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Note

Medium Risk
Adds new format detectors and parsing paths for Codex and Factory AI Droid, and refactors the shared JSONL compactor to support preprocessing; mistakes could mis-detect formats or alter truncation/tool inlining behavior across agents.

Overview
Adds support for compacting Codex JSONL transcripts by detecting session_meta, filtering system-injected user blocks, emitting user/assistant messages, and inlining function_call + function_call_output pairs (plus token_count usage) into compact tool_use blocks.

Adds support for Factory AI Droid transcripts by detecting the envelope format and unwrapping {"type":"message",..."message":{...}} entries via a new JSONL preprocessing hook, so existing compacting logic (tool result inlining, token usage, StartLine truncation) can be reused.

Refactors the core JSONL compaction pipeline to accept an optional per-line preprocessor and updates format detection order so Codex is detected on raw content and Droid is detected after truncation. Includes fixtures and inline tests for both new formats and StartLine semantics.

^{Reviewed by Cursor Bugbot for commit 48b290e. Configure here.}

[Copilot]

Pull request overview

Adds compact transcript conversion support for Factory AI Droid and Codex JSONL formats, enabling full.jsonl → transcript.jsonl generation for these agents.

Changes:

• Added Droid envelope detection + unwrapping preprocessor to reuse the existing JSONL compaction pipeline.
• Added a Codex-specific compactor that filters system-injected content, groups function calls with outputs, and maps token counts.
• Added fixtures and unit tests covering both formats, including StartLine behavior.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
cmd/entire/cli/transcript/compact/compact.go	Routes Codex before truncation; adds JSONL line preprocessor hook; detects Droid after truncation.
cmd/entire/cli/transcript/compact/droid.go	Implements Droid format detection and envelope unwrapping for reuse with JSONL compaction.
cmd/entire/cli/transcript/compact/droid_test.go	Adds Droid fixture + inline test cases (including StartLine).
cmd/entire/cli/transcript/compact/testdata/droid_full.jsonl	Droid full-format fixture input.
cmd/entire/cli/transcript/compact/testdata/droid_expected.jsonl	Expected compact output for Droid fixture.
cmd/entire/cli/transcript/compact/codex.go	Implements Codex format detection, parsing, system-content filtering, tool call/result stitching, and token handling.
cmd/entire/cli/transcript/compact/codex_test.go	Adds Codex fixture + inline test cases (including StartLine + token_count handling).
cmd/entire/cli/transcript/compact/testdata/codex_full.jsonl	Codex full-format fixture input.
cmd/entire/cli/transcript/compact/testdata/codex_expected.jsonl	Expected compact output for Codex fixture.

[computermode]

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^{Reviewed by Cursor Bugbot for commit 48b290e. Configure here.}

[pfleidi]

I had two non-blocking questions about the use of the linePreprocessor type. Otherwise 👍