feat!: Fix timeline parameter passing with SearchManager alignment

BREAKING CHANGE: Timeline MCP tools now use standardized parameter names
- anchor_id → anchor
- before → depth_before
- after → depth_after
- obs_type → type (timeline tool only)

Fixes timeline endpoint failures caused by parameter name mismatch between
MCP layer and SearchManager. Adds new SessionStore methods for fetching
prompts and session summaries by ID.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

CHANGELOG.md

@@ -4,6 +4,37 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
+## [8.0.0] - 2025-12-14
+
+### BREAKING CHANGES
+
+**Timeline MCP Tools Parameter Rename**
+
+Timeline MCP tools now use parameter names matching SearchManager:
+- `anchor_id` → `anchor`
+- `before` → `depth_before`
+- `after` → `depth_after`
+- `obs_type` → `type` (timeline tool only)
+
+**Migration Example:**
+```typescript
+// Old:
+timeline(anchor_id=123, before=10, after=10)
+
+// New:
+timeline(anchor=123, depth_before=10, depth_after=10)
+```
+
+**Affected Tools:** `timeline`, `get_context_timeline`, `get_timeline_by_query`
+
+**Rationale:** Fixes parameter passing bug where timeline tools failed due to name mismatch between MCP layer and SearchManager.
+
+### Fixed
+- Timeline tools now work correctly with proper parameter passing
+- Resolved "Cannot read properties of undefined (reading 'length')" errors in timeline endpoints
+
+---
+
 ## [7.2.1] - 2025-12-14
 
 ## Translation Script Enhancements
@@ -2392,12 +2423,12 @@ None (patch version)
 
 ## [4.3.0] - 2025-10-25
 
-## What's Changed
-* feat: Enhanced context hook with session observations and cross-platform improvements by @thedotmack in https://github.com/thedotmack/claude-mem/pull/25
-
-## New Contributors
-* @thedotmack made their first contribution in https://github.com/thedotmack/claude-mem/pull/25
-
+## What's Changed
+* feat: Enhanced context hook with session observations and cross-platform improvements by @thedotmack in https://github.com/thedotmack/claude-mem/pull/25
+
+## New Contributors
+* @thedotmack made their first contribution in https://github.com/thedotmack/claude-mem/pull/25
+
 **Full Changelog**: https://github.com/thedotmack/claude-mem/compare/v4.2.11...v4.3.0
 
 ## [4.2.10] - 2025-10-25