feat(web): context-injection panel — reconstruct the full hidden affect block (v0.20.2)

The affect console now reconstructs + displays the complete affect-context block
Worldtree assembles into the agent's system prompt — never on any wire, hidden from
regular consumers, surfaced here as the reference-impl's privileged dev view.

- extend build_persona_canon.py to emit mood_directive {occ_directives (15),
  pad_band_fallback, salience, pad_band_cutoff, full_only} into the browser canon
  (strings were already in the pinned d2-mood-render-canon; regen via Worldtree loader)
- canonPadFallback(pad) + canonEmotionDirective(type): byte-exact mirrors of Worldtree
  core/persona/renderer._pad_band_fallback + derive_directive
- renderDirective -> a "CONTEXT INJECTION · reconstructed · hidden from consumers" panel:
  mood descriptor [exact] + mood directive [candidate] + relationship directive [exact]
- honest-partial (affect-egress-reference sec 3): affect.emit is type-only (no
  intensity), so the salience gate can't be evaluated -> show BOTH the OCC emotion
  directive AND the PAD-band fallback with the "injected if intensity >= 0.2" caveat,
  never asserting which fires; fallback alone is exact when no dominant_emotion
- vendor + pin affect-egress-consumer-reference.md (tolerate_drift; worldtree-dev
  co-signs + pings on change). drift 6/6 green
- contract amended for the new reconstruction fns + honest-partial provenance

Verified: pytest tests/test_web_* (84) + node Playwright (sindra dominant_emotion=joy
-> joy OCC directive candidate + PAD-band fallback both render with exact/candidate tags).

scripts/build_persona_canon.py

@@ -31,6 +31,21 @@ out = {
     "_generated_by": "scripts/build_persona_canon.py (regen on canonical_drift flag)",
     "_render_path": "deterministic, no LLM; mirrors Worldtree describe_pad + render_d2_canonical byte-exact",
     "mood_grid": mood["describe_pad"]["valence_arousal_grid"],
+    # Context-injection reconstruction (affect-egress-consumer-reference §2b/2c): the
+    # hidden mood DIRECTIVE. occ_directives = per-OCC-type behavioral string + tier;
+    # pad_band_fallback = the P×A-quadrant default when no emotion is salient. The
+    # salience gate (emotion_salience) + full_only tiers drive which one fires — but
+    # affect.emit is type-only (no intensity), so the consumer shows BOTH candidates.
+    "mood_directive": {
+        "salience": mood["thresholds"]["emotion_salience"],
+        "pad_band_cutoff": mood["thresholds"]["pad_band_cutoff"],
+        "full_only": mood["emotion_tiers"]["full_only"],
+        "occ_directives": {
+            t: {"directive": e["directive"], "tier": e["tier"]}
+            for t, e in mood["derive_directive"]["occ_directives"].items()
+        },
+        "pad_band_fallback": mood["pad_band_fallback"],
+    },
     "relation": {
         "trust_cuts": [list(c) for c in canon.trust_cuts],
         "warmth_cuts": [list(c) for c in canon.warmth_cuts],