remove ExportData field and dead file write from OpenCode WriteSession

[gtrrz-victor]

• replace sql queries with opencode session delete
• remove ExportData field and dead file write from OpenCode WriteSession

[cursor]

PR Summary

Medium Risk
Changes the rewind/resume restore mechanism for OpenCode and replaces direct DB deletes with an external CLI command, so behavior depends on opencode output/availability and could impact rewind correctness.

Overview
Simplifies OpenCode session persistence by removing the AgentSession.ExportData field and updating resume/rewind/logs-only restore paths to rely solely on NativeData when calling WriteSession.

OpenCodeAgent.WriteSession no longer writes a checkpoint JSON file and now only (re)imports the transcript into OpenCode; rewind cleanup is switched from direct SQLite sqlite3 deletion to a new runOpenCodeSessionDelete wrapper around opencode session delete (treating “session not found” as success).

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[gtrrz-victor]

@cursor review

[Copilot]

Pull request overview

This PR refactors the OpenCode agent restore path by removing the ExportData field from agent.AgentSession, deleting the legacy direct-SQLite deletion code, and switching session cleanup to an OpenCode CLI session delete command before re-import.

Changes:

• Removed ExportData from agent.AgentSession and updated call sites to pass only NativeData.
• Deleted the OpenCode SQLite helper (direct sqlite3 query execution) and replaced it with opencode session delete.
• Simplified OpenCodeAgent.WriteSession to import only (no longer writes the transcript file to SessionRef).

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
cmd/entire/cli/strategy/manual_commit_rewind.go	Stops populating ExportData when restoring logs-only sessions.
cmd/entire/cli/rewind.go	Removes ExportData usage when restoring transcripts from checkpoint/shadow storage.
cmd/entire/cli/resume.go	Removes ExportData usage when resuming a session from checkpoint storage.
cmd/entire/cli/agent/session.go	Removes the ExportData field from the shared session struct.
cmd/entire/cli/agent/opencode/sqlite.go	Deletes legacy direct SQLite deletion implementation.
cmd/entire/cli/agent/opencode/opencode.go	Updates OpenCode Read/Write session behavior; WriteSession becomes import-only and uses session delete before import.
cmd/entire/cli/agent/opencode/cli_commands.go	Adds runOpenCodeSessionDelete command wrapper for deleting sessions via OpenCode CLI.

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