feat: skill fast-path hardening, lineage retune + colors, per-tab pop-out, reliable tab alerts

- SKILL.md: forbid the standalone preamble check and pre-spawn recon turns
  (measured: two wasted model turns cost ~12s of a 28s two-worker run; the
  hardened flow measured 20.2s cold / 12.8s warm end to end)
- Lineage lines: dip now hangs from the strip's bottom edge (cap 104 -> 64,
  no stacked row offsets), fixing the deep bow in wrapped strips and keeping
  row-1 arcs off row-2 tab labels; per-child color palette (skin blue first,
  then matrix green, pink, violet, red, turquoise, orange) via an inline
  --lineage-color custom property
- Session Options -> Session: per-TAB pop-out (open-in-window) button override
  on top of the general showTabDetachButton setting; per-device localStorage
  map rendered as the tab-show-detach class
- Tab alerts: seed the pending-hook state machine from GET /api/approvals
  regardless of the approvals-inbox setting (reloads used to lose the red tab
  entirely with the inbox off), clear unconditionally on approval_resolved,
  and repaint the alert as a steady red/yellow ring + glow + status dot on a
  ::before overlay so it stays visible on the selected (active) tab until the
  permission is actually resolved
- docs: worker warm-pool design sketch (verified numbers baked in)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/web/public/index.html

@@ -1211,6 +1211,13 @@
                       </button>
                     </div>
                   </div>
+                  <div class="set-row" data-search="pop out detach tab window this session">
+                    <div class="set-row-text">
+                      <span class="set-row-label">Pop-out button on this tab</span>
+                      <span class="set-row-desc">Show the open-in-a-window button on this tab even while the general App Settings toggle is off.</span>
+                    </div>
+                    <label class="switch switch-sm"><input type="checkbox" id="sessionOptShowTabDetach" onchange="app.onSessionTabDetachToggle(this.checked)"><span class="slider"></span></label>
+                  </div>
                 </div>
               </div>