Add /chronicle:reindex command to rebuild local session index from JS…

[vijayupadya]

Adds a /chronicle:reindex slash command that rebuilds the local Chronicle SQLite session store by re-reading JSONL debug logs from disk. This enables users to manually recover session data that the live tracker may have missed, or to populate the index after enabling the local indexing setting.

[Copilot]

Pull request overview

Adds a new /chronicle:reindex slash command to rebuild the local Chronicle SQLite session store by replaying per-session JSONL debug logs written to disk.

Changes:

• Add chronicle:reindex command wiring (intent routing, command registration, and localized description).
• Introduce a new sessionReindexer implementation + unit tests to stream debug-log entries and write sessions/turns/files/refs into the SQLite store.
• Refactor session-store tracking helpers to share truncation limits and utility helpers (truncateForStore, isTerminalTool).

Show a summary per file

File	Description
extensions/copilot/src/extension/intents/node/chronicleIntent.ts	Routes /chronicle:reindex and emits progress + telemetry for reindex runs.
extensions/copilot/src/extension/common/constants.ts	Registers chronicle:reindex command mapping to the Chronicle intent.
extensions/copilot/src/extension/chronicle/vscode-node/sessionStoreTracker.ts	Reuses shared truncation + terminal-tool detection helpers.
extensions/copilot/src/extension/chronicle/node/sessionReindexer.ts	New reindexer that streams JSONL debug logs and writes into the session store.
extensions/copilot/src/extension/chronicle/node/test/sessionReindexer.spec.ts	Adds unit coverage for the reindexer behavior.
extensions/copilot/src/extension/chronicle/common/sessionStoreTracking.ts	Adds shared truncation constants/helpers and terminal-tool detection.
extensions/copilot/package.nls.json	Adds localized description for /chronicle:reindex.
extensions/copilot/package.json	Contributes the chronicle:reindex slash command.

Copilot's findings

Comments suppressed due to low confidence (1)

extensions/copilot/src/extension/chronicle/node/sessionReindexer.ts:256

• processAssistantResponse reads entry.attrs.outputMessages, but the debug logger writes the serialized output messages under attrs.response for agent_response entries (and llm_request entries don't carry output messages). As-is, reindexing is likely to miss assistant responses entirely. Update the parser to use the actual attribute names from IChatDebugFileLoggerService output (and/or support both keys for backward compatibility).

	// Extract assistant response from outputMessages attribute (same as sessionStoreTracker)
	const outputMessagesRaw = entry.attrs.outputMessages as string | undefined;
	const assistantResponse = extractAssistantResponse(outputMessagesRaw);

• Files reviewed: 8/8 changed files
• Comments generated: 3