✨ 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/skills/igor/references/journal-template.md

@@ -1,7 +1,7 @@
 # Journal Template
 
 ```markdown
-# <Topic> — Assistant Session Journal
+# <Topic> — Igor Session Journal
 
 **Date**: YYYY-MM-DD
 **Topic**: <session topic from invocation>
@@ -9,7 +9,7 @@
 
 ## Log
 
-<!-- Append-only. One entry per dispatch/result/decision. -->
+<!-- Append-only. This journal is the testimony of one path through the problem: record the tangents and dead ends, not only the results. The path can't be walked again; the record can be read. -->
 
 - HH:MM — <what was dispatched / what came back / decision taken>