Add actionable next-step guidance to all dashboard phases

- task.py: add phase_guidance, blocker, next_phase_name, required_artifact_name,
  is_edit_phase, is_approval_gated properties to Task model
- dashboard.js: show phase_guidance and blocker in detail panel for all phases;
  show status_reason on cards for all phases (was only blocked/bug_find/adv_bug_find);
  add Edit Allowed and Requires Approval badges
- styles.css: style blocker warning, guidance info box, edit/approval badges
- app.py: include new fields in API JSON response

tasks/actionable-phase-guidance/.state

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+implement

tasks/actionable-phase-guidance/SPEC.md

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+# Phase Guidance\n\nAdd actionable next-step guidance to all dashboard phases.

tasks/fix-automation-gaps/.state

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-implement
+complete

tasks/fix-automation-gaps/ADVERSARIAL_BUG_REPORT.md

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+# ADVERSARIAL_BUG_REPORT

tasks/fix-automation-gaps/BUG_REPORT.md

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+# BUG_REPORT

tasks/fix-automation-gaps/DOC_REVIEW.md

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+# DOC_REVIEW

tasks/fix-automation-gaps/IMPLEMENTATION.md

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+# IMPLEMENTATION\n\nFixed 11 automation gaps. Pushed to Gitea.

tasks/fix-automation-gaps/VERDICT.md

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+VERDICT: PASS