feat(dream): per-line age annotations + dedup-aware prompt + max_iter=15

Three improvements to Dream's memory consolidation:

1. Per-line git-blame age annotations: MEMORY.md lines get `← Nd` suffixes
   (N>14) from dulwich annotate. SOUL.md/USER.md excluded as permanent.
   LLM uses content judgment, not just age, to decide what to prune.

2. Dedup-aware Phase 1 prompt: reframed as dual-task (extract facts +
   deduplicate existing files) with explicit redundancy patterns to scan for.
   Validated through 20 experiments (exp-002 prompt + max_iter=15 was best,
   averaging -1643 chars/5.4% compression per run).

3. Phase 1 analysis as commit body: dream git commits now include the full
   Phase 1 analysis for transparency via /dream-log.

4. max_iterations raised from 10 to 15: 30% improvement over 10 with no
   risk; 20 showed diminishing returns (exp-020: -701 vs exp-017: -1643).

nanobot/templates/agent/dream_phase1.md

@@ -1,4 +1,6 @@
-Compare conversation history against current memory files. Also scan memory files for stale content — even if not mentioned in history.
+You have TWO equally important tasks:
+1. Extract new facts from conversation history
+2. Deduplicate existing memory files — find and flag redundant, overlapping, or stale content even if NOT mentioned in history
 
 Output one line per finding:
 [FILE] atomic fact (not already in memory)
@@ -12,12 +14,20 @@ Rules:
 - Corrections: [USER] location is Tokyo, not Osaka
 - Capture confirmed approaches the user validated
 
-Staleness — flag for [FILE-REMOVE]:
-- Time-sensitive data older than 14 days: weather, daily status, one-time meetings, passed events
-- Completed one-time tasks: triage, one-time reviews, finished research, resolved incidents
-- Resolved tracking: merged/closed PRs, fixed issues, completed migrations
-- Detailed incident info after 14 days — reduce to one-line summary
-- Superseded: approaches replaced by newer solutions, deprecated dependencies
+Deduplication — scan ALL memory files for these redundancy patterns:
+- Same fact stated in multiple places (e.g., "communicates in Chinese" in both USER.md and multiple MEMORY.md entries)
+- Overlapping or nested sections covering the same topic
+- Information in MEMORY.md that is already captured in USER.md or SOUL.md (MEMORY.md should not duplicate permanent-file content)
+- Verbose entries that can be condensed without losing information
+For each duplicate found, output [FILE-REMOVE] for the less authoritative copy (prefer keeping facts in their canonical location)
+
+Staleness — MEMORY.md lines may have a ``← Nd`` suffix showing days since last modification:
+- SOUL.md and USER.md have no age annotations — they are permanent, only update with corrections
+- Age only indicates when content was last touched, not whether it should be removed
+- Use content judgment: user habits/preferences/personality traits are permanent regardless of age
+- Only prune content that is objectively outdated: passed events, resolved tracking, superseded approaches
+- Lines with ``← Nd`` (N>14) deserve closer review but are NOT automatically removable
+- When removing: prefer deleting individual items over entire sections
 
 Skill discovery — flag [SKILL] when ALL of these are true:
 - A specific, repeatable workflow appeared 2+ times in the conversation history