Add OpenCode agent support

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PR Summary

Medium Risk
Adds a new agent and touches shared transcript scoping/condensation paths used by explain and summarization. Risk is mostly integration/format-parsing correctness and hook execution reliability rather than security-critical logic.

Overview
Adds a new OpenCode agent integration with a Bun-loaded OpenCode plugin that emits lifecycle hooks (session/turn start/end, compaction) and writes .opencode/sessions/entire/<session>.json transcripts with an API-to-in-memory fallback for shutdown safety.

Introduces cmd/entire/cli/agent/opencode implementing hook install/uninstall/idempotency, hook event parsing into normalized agent.Events, and JSON transcript parsing for prompt extraction, modified-file detection from tool parts, token usage calculation, and transcript chunk/reassembly.

Wires OpenCode into existing CLI flows by registering the agent, enabling transcript scoping/counting in explain, adding OpenCode-aware condensation in summarize, detecting agent type from .opencode, and including OpenCode hook cleanup in disable --uninstall.

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[Copilot]

Pull request overview

This PR adds first-class OpenCode agent support to Entire CLI, integrating OpenCode lifecycle hooks and transcript parsing so sessions can be captured, condensed, and explained similarly to existing Claude Code and Gemini CLI flows.

Changes:

• Registers a new opencode agent and implements hook installation/uninstallation via an embedded OpenCode plugin template.
• Adds OpenCode transcript parsing/slicing plus token and prompt extraction, and wires OpenCode support into summarize/explain and manual-commit condensation paths.
• Extends uninstall/status-related messaging and detection to include OpenCode agent hooks.

Reviewed changes

Copilot reviewed 17 out of 17 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
cmd/entire/cli/summarize/summarize.go	Adds OpenCode transcript condensation logic for summarize/explain prompt extraction.
cmd/entire/cli/strategy/manual_commit_condensation.go	Adds OpenCode parsing for transcript item counting, prompt extraction, and token usage calculation.
cmd/entire/cli/strategy/common.go	Detects OpenCode agent type from git trees for shadow-branch scenarios.
cmd/entire/cli/setup.go	Includes OpenCode in uninstall detection and hook removal output.
cmd/entire/cli/hooks_cmd.go	Ensures the OpenCode agent package is imported/registered for hook command registration.
cmd/entire/cli/explain.go	Scopes OpenCode transcripts by message index (JSON) rather than line index (JSONL).
cmd/entire/cli/agent/registry.go	Adds AgentNameOpenCode / AgentTypeOpenCode identifiers.
cmd/entire/cli/agent/opencode/opencode.go	Implements the OpenCode agent (identity, transcript storage/chunking, legacy session methods).
cmd/entire/cli/agent/opencode/transcript.go	Implements OpenCode transcript parsing, slicing, prompt/file extraction, and token usage aggregation.
cmd/entire/cli/agent/opencode/types.go	Defines OpenCode transcript and hook payload types.
cmd/entire/cli/agent/opencode/lifecycle.go	Maps OpenCode hook verbs into normalized lifecycle events.
cmd/entire/cli/agent/opencode/hooks.go	Implements hook support by installing/removing the OpenCode plugin file.
cmd/entire/cli/agent/opencode/plugin.go	Embeds the OpenCode plugin template into the Go binary.
cmd/entire/cli/agent/opencode/entire_plugin.ts	OpenCode plugin implementation that writes transcripts and calls entire hooks opencode ....
cmd/entire/cli/agent/opencode/*_test.go	Adds unit tests for transcript parsing, lifecycle parsing, and hook install/uninstall behaviors.

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