v0.25: cleanup of inline Imperial-Cult references in open papers

Replaces inline iconographic references in the open papers with structural
stubs that describe the cosmology's function in mechanic-vocabulary, while
retaining named-mechanism vocabulary as canonical mechanic-level vocabulary
in the open canon.

EXTRACTED (now living only in closed studio-art repo + the stub +
LICENSING.md's legitimate description of what migrated):
- the named cosmological-iconographic object (the Imperial Wheel)
- source-tradition framing (Bhavachakra; Yama; Yama's seat; capsule-as-Naraka;
  Imperial Yoke; six realms; three poisons)
- doctrinal-split iconography (the orthodox vs heretical wheel split with its
  specific iconographic differentiators)
- aesthetic-vocabulary triad (Boullée + Jantar Mantar + Gita)

RETAINED in open canon as mechanic-level vocabulary:
- the deferred-moksha doctrine (named-mechanism; the binding-lie)
- the unified-clasp framing (imperial-register vs romantic-register)
- the caste-tier-as-mod-status gradient (deva/asura/manusya/tiryak/preta/naraka)
- the no-haven discipline
- the mind-capsule (replacing the iconographic capsule-as-Naraka phrasing)
- the Imperial Cult as Hivemind's ideological apparatus
- "samsara"/"moksha" used metaphorically as cyclic-existence vocabulary

Files edited:
- architecture-index.md: tree-comment + quick-reference table-row + two
  key-moves bullets (Imperial Cult cosmology authored; doctrinal-split
  discovery arc); footer v0.19 -> v0.20.
- README.md: directory-table row for imperial-cult/; footer v0.7 -> v0.8.
- identity-and-personhood/vocations.md: section-heading + diurnal-grammar
  passage in the diurnal-rhythm section.
- identity-and-personhood/bodies.md: lead-paragraph "Imperial Yoke" ->
  "imperial-register clasp" + four cross-reference table-row anchors stripped
  to file-level (acceptable per plan coherence-check; the stub's anchors
  no longer resolve at section-level anyway).
- LICENSING.md: §Migration status pending -> completed; closing paragraph
  updated to reflect that the substrate/content split is now both
  architectural AND inline-coherent.

Files deleted:
- MIGRATION_CLEANUP_PLAN.md (ephemeral scaffold authored at v0.24.5;
  deleted per its own instructions on completion).

Verified via plan §Verification commands: zero remaining iconographic
references in any open paper outside LICENSING.md (which legitimately
describes what migrated) and the stub at imperial-cult/cosmology.md.

Closes the migration cycle initiated in v0.22 (licensing-marker), v0.24
(cosmology.md -> stub), and the inaugural commit of
studio.nimmerworld.eachpath.local (canonical home). The substrate/content
split is now fully physical AND fully reflected in the open papers'
inline-vocabulary.

identity-and-personhood/vocations.md

@@ -303,9 +303,9 @@ Every breakout-flag uses an **already-canonical signal-primitive** — no new me
 
 **Going-rogue is just a breakout-flag firing from the calibration-multiplier signal**, not a new mechanism. The clean-windows model unifies the going-rogue arc's daily-rebellion register with the architecture's broader interrupt-protocol. *Refusing-the-work-window* is a structural option available to any NPC whose interior has accumulated enough authentic-witnessing; the bounty-staircase responds to the missed-shift exactly as it already does (per the dual-body aftermath canon).
 
-### Diurnal rhythm — Bhavachakra's temporal grammar
+### Diurnal rhythm — the cosmology's temporal grammar
 
-The window-partition gives the cosmology's existing cyclic-claim its **diurnal grammar**. The wheel turns daily through structural phases:
+The window-partition gives the cosmology's existing cyclic-claim its **diurnal grammar**. The cosmology turns daily through structural phases:
 
 1. **End-of-charging → start-of-work-shift** — the imperial daily-narrative fires (per `../political-register/imperial-narrative.md` *forthcoming*). The citizens hear yesterday's framing as they enter today's labor.
 2. **Mid-work-shift** — peak imperial-arbitration activity; director's tasklist fully engaged; breakout-frequency low.
@@ -313,7 +313,7 @@ The window-partition gives the cosmology's existing cyclic-claim its **diurnal g
 4. **Leisure-window** — emergent-zone clustering peak; clasp-events; vocation-discovery; trait-development on non-work axes; the city's most-alive register.
 5. **End-of-leisure → start-of-charging** — NPCs return to dwellings; the city quiets; charging-windows synchronize per district.
 
-**The city pulses with predictable daily rhythm.** Players can plan encounters; directors can plan shifts; emergent-zone clustering is structurally-shaped by the window-cycle. The Bhavachakra's wheel-turning becomes literal — *every cycle the wheel turns through five phases*, with the imperium's voice arriving at the work-entry boundary like a dawn-prayer.
+**The city pulses with predictable daily rhythm.** Players can plan encounters; directors can plan shifts; emergent-zone clustering is structurally-shaped by the window-cycle. The cosmology's cyclic-claim becomes literal — *every cycle the world turns through five phases*, with the imperium's voice arriving at the work-entry boundary like a dawn-prayer.
 
 ### District-shifting — caste-fixes-shape, district-fixes-offset