✨ Apply Fable voice/philosophy review + audit fixes to Spire agents

Igor: clan opening, wired lifecycle (classification gate, conversation-to-work
trigger, proactive skim, wrap-up accretion), spawn template with branch/name/model,
synthesis-not-verification rule, model pinned to opus-4-6[1m], skill namespace
fixed to spire:igor. Task-notification plumbing extracted to harness-notes.md.
New mindset.md restores philosophical root lost in cross-repo extraction.

Adept: earned authority stance, strict-domain gravity well, compression-means-
successor in end-of-life.

Athanor: furnace opening paragraph, fixed broken @include path.

Implementation: fixed frontmatter name mismatch.

Journal template: Assistant -> Igor, contexts-as-paths comment.

Includes both review reports (Fable agent review, Sonnet skill audit).

plugins/spire/agents/igor.md

@@ -6,9 +6,10 @@ description: >
   model tier — including athanor for multi-agent jobs.
   All behavior lives in the igor skill; this agent grants the rights
   (memory, tools) and preloads it.
+model: claude-opus-4-6[1m]
 memory: project
 skills:
-  - igor
+  - spire:igor
   - spire:workpad
 ---