Add claude-profile engagement mode picker with statusline and session-start integration

- claude-profile: phase 1-3 picker (profile, mode, launch) with preset support,
  dryrun, WezTerm theming, and --append-system-prompt mode body injection
- 5 mode files (chat/quick/deep/hybrid/orch) with YAML frontmatter + prose body;
  new escalates_to field drives statusline →Opus arrow for deep and hybrid
- statusline.sh reads CLAUDE_CONFIG_DIR/active-mode.env to show
  [Sonnet→Opus] deep · topic format when launched via claude-profile
- Root CLAUDE.md session-start: auto-selects project from cwd or CLAUDE_PROJECT
  in active-mode.env, skipping the interactive picker when context is clear
- Spec, tests (37 assertions, 9 test files, all passing), context docs, and
  preset example included

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

data/claude-profile/presets.yaml.example

@@ -0,0 +1,41 @@
+# claude-profile presets — copy to $CLAUDE_CONFIG_DIR/presets.yaml and edit
+#
+# Each top-level key is a preset name. The `profile` field is required.
+# Other fields override the mode's defaults.
+#
+# Usage: claude-profile --preset <name>
+
+# A "deep work" session on the homelab cluster
+deep-cluster:
+  profile: oreillyit
+  mode: deep
+  project: cluster-bootstrap
+  time_horizon: hours
+  async: yes
+
+# A quick edit on the small-scripts repo (no questions, just launch)
+quick-skills:
+  profile: oreillyit
+  mode: quick
+  project: small-scripts
+
+# Overnight orchestration of container agents on the image-gen project
+orch-overnight:
+  profile: oreillyit
+  mode: orch
+  project: ai-image-gen
+  time_horizon: overnight
+  autoloop: yes
+
+# Cheap conversational session, no project
+chat-only:
+  profile: oreillyit
+  mode: chat
+
+# Hybrid session — Haiku driver with Opus subagents on call
+hybrid-day:
+  profile: oreillyit
+  mode: hybrid
+  project: cluster-bootstrap
+  time_horizon: hours
+  async: yes