chore(naming): migrate .machine_readable/6a2 -> descriptiles (estate mandate 2026-06-30) (#68)

- git mv .machine_readable/6a2 -> .machine_readable/descriptiles (11 files,
  history preserved via rename detection)
- update every 6a2 reference: GOVERNANCE.adoc, descriptiles/README.adoc,
  0-AI-MANIFEST.a2ml, PLAYBOOK.a2ml, bot_directives/{coverage,debt}.a2ml
- Mustfile.a2ml self-checks: point six-file + anchor checks at descriptiles
  (anchor singular — the tracked dir; 'anchors' plural was untracked local
  debris that could never pass on a fresh clone); drop the
  bust-dust-files-present check whose target files were deleted by the
  estate standardization (a critical check that could never pass)
- zero '6a2' occurrences remain repo-wide; no CI/script referenced the
  old path (verified before rename)

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

Author: hyperpolymath

.machine_readable/bot_directives/coverage.a2ml

@@ -26,6 +26,6 @@ notes = "Parser totality + Merkle combiner generalization + manifest round-trip
 date = "2026-06-05"
 ring = 1
 fixes = 7
-notes = "Refreshed 6a2 (all six) + ANCHOR from the March .scm stubs; recorded D1/D2/D3, proven surface, honest bounds, runbooks; reconciled all open branches into one main."
+notes = "Refreshed descriptiles (all six) + ANCHOR from the March .scm stubs; recorded D1/D2/D3, proven surface, honest bounds, runbooks; reconciled all open branches into one main."
 
 # Skipped MUSTs / cherry-picking audit: none recorded this session.

.machine_readable/bot_directives/debt.a2ml

@@ -41,7 +41,7 @@ impact = "medium"
 discovered = "2026-06-05"
 
 [[debt.could]]
-component = ".machine_readable/6a2/ (estate-wide)"
+component = ".machine_readable/descriptiles/ (estate-wide)"
 issue = "phase vocabulary is not pinned by an enforced standard (svalinn 'crg-c-testing' vs ochrance 'implementation') — possible standards↔rsr-template divergence (Flag A); confirm against the canonical standards spec."
 effort = "medium"
 impact = "medium"

.machine_readable/contractiles/Mustfile.a2ml

@@ -56,19 +56,14 @@ hooks fail if any check fails.
 - run: test -f .machine_readable/contractiles/Intentfile.a2ml && test -f .machine_readable/contractiles/Mustfile.a2ml && test -f .machine_readable/contractiles/Trustfile.a2ml && test -f .machine_readable/contractiles/Adjustfile.a2ml
 - severity: critical
 
-### bust-dust-files-present
-- description: Bustfile and Dustfile exist in their directories
-- run: test -f .machine_readable/contractiles/bust/Bustfile.a2ml && test -f .machine_readable/contractiles/dust/Dustfile.a2ml
+### descriptiles-directory-present
+- description: descriptiles directory exists with the six required files
+- run: test -d .machine_readable/descriptiles && test -f .machine_readable/descriptiles/META.a2ml && test -f .machine_readable/descriptiles/ECOSYSTEM.a2ml && test -f .machine_readable/descriptiles/STATE.a2ml && test -f .machine_readable/descriptiles/PLAYBOOK.a2ml && test -f .machine_readable/descriptiles/AGENTIC.a2ml && test -f .machine_readable/descriptiles/NEUROSYM.a2ml
 - severity: critical
 
-### six-directory-present
-- description: 6a2 directory exists with required files
-- run: test -d .machine_readable/6a2 && test -f .machine_readable/6a2/META.a2ml && test -f .machine_readable/6a2/ECOSYSTEM.a2ml && test -f .machine_readable/6a2/STATE.a2ml && test -f .machine_readable/6a2/PLAYBOOK.a2ml && test -f .machine_readable/6a2/AGENTIC.a2ml && test -f .machine_readable/6a2/NEUROSYM.a2ml
-- severity: critical
-
-### anchors-directory
-- description: anchors directory exists in 6a2
-- run: test -d .machine_readable/6a2/anchors
+### anchor-directory
+- description: anchor directory exists in descriptiles
+- run: test -d .machine_readable/descriptiles/anchor
 - severity: warning
 
 ### self-validating-structure

.machine_readable/6a2/0-AI-MANIFEST.a2ml …readable/descriptiles/0-AI-MANIFEST.a2ml.machine_readable/6a2/0-AI-MANIFEST.a2ml renamed to .machine_readable/descriptiles/0-AI-MANIFEST.a2ml .machine_readable/6a2/0-AI-MANIFEST.a2ml renamed to .machine_readable/descriptiles/0-AI-MANIFEST.a2ml

@@ -1,8 +1,8 @@
-# AI Manifest for 6a2 Directory
+# AI Manifest for descriptiles Directory
 
 ## Purpose
 
-This manifest declares the AI-assistant context for the 6a2 machine-readable metadata directory.
+This manifest declares the AI-assistant context for the descriptiles machine-readable metadata directory.
 
 ## Canonical Locations
 

.machine_readable/6a2/AGENTIC.a2ml …chine_readable/descriptiles/AGENTIC.a2ml.machine_readable/6a2/AGENTIC.a2ml renamed to .machine_readable/descriptiles/AGENTIC.a2ml .machine_readable/6a2/AGENTIC.a2ml renamed to .machine_readable/descriptiles/AGENTIC.a2ml

@@ -15,7 +15,7 @@ suites = "A2ML parser, property, integration, and tests/e2e_test.sh"
 
 [incident-response]
 steps = [
-  "Check .machine_readable/6a2/STATE.a2ml for current status, blockers, and next actions",
+  "Check .machine_readable/descriptiles/STATE.a2ml for current status, blockers, and next actions",
   "Review recent commits and CI results on main",
   "Re-run the proof build (idris2 --build ochrance.ipkg) and the affected suite",
 ]

.machine_readable/6a2/ECOSYSTEM.a2ml …ine_readable/descriptiles/ECOSYSTEM.a2ml.machine_readable/6a2/ECOSYSTEM.a2ml renamed to .machine_readable/descriptiles/ECOSYSTEM.a2ml .machine_readable/6a2/ECOSYSTEM.a2ml renamed to .machine_readable/descriptiles/ECOSYSTEM.a2ml

@@ -1,8 +1,8 @@
 // SPDX-License-Identifier: CC-BY-SA-4.0
 // Copyright (c) Jonathan D.A. Jewell <j.d.a.jewell@open.ac.uk>
-# A2ML 6a2 Directory
+# A2ML descriptiles Directory
 
-This directory contains the 6 core A2ML machine-readable metadata files for this repository.
+This directory contains the 6 core A2ML machine-readable metadata files (descriptiles) for this repository.
 
 ## Files
 
@@ -26,5 +26,5 @@ Source .scm files should be removed after successful transpilation.
 ## See Also
 
 - [A2ML Repository Template](https://github.com/hyperpolymath/standards/blob/main/A2ML-REPO-TEMPLATE.adoc)
-- [6A2 Format Family](https://github.com/hyperpolymath/standards#a2ml-format-family-7-formats)
+- [Descriptiles Format Family](https://github.com/hyperpolymath/standards#a2ml-format-family-7-formats)