feat(scout-agent): add conversation compaction module

Adds conversation compaction support to prevent context overflow errors.

Features:
- Token counting using ai-tokenizer with model-specific accuracy
- Compaction tool (compact_conversation) for summarizing conversations
- Warning message generation when approaching token limits
- Context length error detection for various providers
- Emergency compaction for when compaction request exceeds context

Exports:
- countConversationTokens - Count tokens in ModelMessage[]
- shouldCompact - Check if compaction is needed
- findCompactionSummary - Find existing compaction in messages
- applyCompaction - Replace pre-compaction messages with summary
- createCompactionTool - Create the compact_conversation tool
- createCompactionWarningMessage - Generate warning message
- isContextLengthError - Detect context overflow errors
- calculateEmergencyCompactionConfig - Plan emergency compaction
- createEmergencyCompactionMessage - Generate emergency request
- prepareEmergencyCompactionMessages - Split messages for emergency

Includes 21 tests covering all functionality.

Author: blink-so[bot]

bun.lock

@@ -1,6 +1,5 @@
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         "@octokit/webhooks": "^14.1.3",
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