fix mid turn commits not creating checkpoints

[Soph]

If OpenCode was given instructions like "do xyz and then commit" the commit would be created with a Entire-Checkpoint trailer but no checkpoint in entire/checkpoints/v1 was created. The reason was that the session log was only exported at the end of the prompt, now we export it on demand.

[cursor]

PR Summary

Medium Risk
Touches the condensation/hook path for all agents via a new best-effort transcript preparation step; failures are ignored, but it changes when/if transcripts are read or generated during commits.

Overview
Fixes OpenCode mid-turn agent commits that previously added an Entire-Checkpoint trailer but failed to write checkpoint data to entire/checkpoints/v1, by ensuring a transcript exists before condensation reads it.

Adds OpenCodeAgent.PrepareTranscript() to lazily create the .entire/tmp/<sessionID>.json transcript via opencode export when missing, wires a best-effort prepareTranscriptIfNeeded() into the manual-commit condensation and hook paths, and extends unit/integration tests (including a new TestOpenCodeMidTurnCommit) plus test helpers to pre-seed mock exports.

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[Copilot]

Pull request overview

This PR addresses missing checkpoint data for OpenCode “mid-turn” commits by ensuring the OpenCode transcript is made available on-demand (instead of only at turn-end), so condensation can write checkpoint metadata to entire/checkpoints/v1.

Changes:

• Add a strategy-level helper to best-effort “prepare” (materialize/flush) transcripts before reading them.
• Implement agent.TranscriptPreparer for OpenCode to export transcripts on demand.
• Add integration + unit tests covering mid-turn commit checkpoint creation and PrepareTranscript validation behavior.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
cmd/entire/cli/strategy/manual_commit_hooks.go	Ensures transcript is prepared before attempting transcript-based file extraction during hook flows.
cmd/entire/cli/strategy/manual_commit_condensation.go	Prepares live transcript before reading it for condensation, including mid-session commit paths.
cmd/entire/cli/strategy/common.go	Adds prepareTranscriptIfNeeded helper to invoke TranscriptPreparer best-effort.
cmd/entire/cli/agent/opencode/transcript.go	Declares OpenCode implements agent.TranscriptPreparer.
cmd/entire/cli/agent/opencode/lifecycle.go	Implements OpenCodeAgent.PrepareTranscript using opencode export (or mock mode).
cmd/entire/cli/agent/opencode/lifecycle_test.go	Adds unit tests for PrepareTranscript path validation / no-op behavior.
cmd/entire/cli/integration_test/opencode_hooks_test.go	Adds integration test for mid-turn agent commit creating checkpoint data on metadata branch.
cmd/entire/cli/integration_test/hooks.go	Adds helper to stage a mock OpenCode export file in .entire/tmp/ for tests.

[cursor]

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