feat(system): STATUS board, flow DPLAN fixes, prompt architecture, dev.local.md (#32)

STATUS board: per-branch STATUS.local.md with central aggregation via
drone @prax status sync. Prax handler scans AIPASS_REGISTRY.json and
builds collapsible STATUS.md at repo root (14 operational, 1 in-progress).

Flow: migrated all 10 DPLAN handler files from Dev-Pass paths to
Path(__file__)-based resolution. Fixed FPLAN template detection
(is_template_content was deleting plans with real content).

Prompts: breadcrumbs philosophy in global prompt, dev.local.md awareness,
devpulse branch prompt revised (expertise table, working habits, git hygiene).

ai_mail: sender identity fix propagated, email.py handler refactoring.

Prax: status sync handler, dashboard command collision fix, central/reader.py.

dev.local.md seeded across all 15 branches + spawn template. Gitignore
updated (dev.local.md, STATUS.local.md, CLOSED_PLANS.local.json, backup_data).

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

src/aipass/trigger/dev.local.md

@@ -0,0 +1,15 @@
+# dev.local.md - TRIGGER
+```
+Branch: /home/coder/workspace/AIPass/src/aipass/trigger
+Created: 2026-03-07
+```
+
+## Issues
+
+-
+
+---
+
+## Todos
+
+-