Standardize .machine_readable to estate 06-12 layout + Echo/Landauer currency

[hyperpolymath]

What this is

The eclexia slice of an estate-wide reconciliation + governance checkpoint. Two commits, docs/metadata only — no source, no build impact:

1. chore(governance) — bring .machine_readable/ to the 06-12 estate standard:
   • flat contractiles {Adjust,Bust,Dust,Intent,Must,Trust}.a2ml + Justfile; old nested bust/+must/+trust/ removed
   • bot_directives trio hypatia / gitbot-fleet / git-private-farm (+ README.adoc), grounded in eclexia's real workflows (propagation is live here — instant-sync.yml ships) and Rust/Coq facts; secret NAMES only
   • rename svc/k9 → self-validating
   • governance docs: CODEOWNERS, GOVERNANCE.adoc, MAINTAINERS.adoc, CODE_OF_CONDUCT.md, CONTRIBUTING, issue templates; 6a2/0-AI-MANIFEST.a2ml + README.adoc; formal/coq/manifest.scm
2. docs(currency) — Echo/Landauer realignment:
   • 6a2/STATE.a2ml: current build snapshot (25 crates, 519 tests, axiom-free EchoThermo.v), Echo + Landauer milestones, honest Known-Gaps, Echo follow-ons
   • ANCHOR.scm: records the 2026-06-13 realignment (Echo is now core — type former + landauer_cost resource bridge), adds Echo to semantic-authority.owns, fixes stale mandatory-files (./STATE.scm → .machine_readable/6a2/*.a2ml)
   • .claude/CLAUDE.md: fixes the stale .scm artefact paths

⚠️ Upstream template bug found (systemic — needs an rsr-template-repo fix)

The estate branch's flat contractiles were copied from rsr-template-repo without substituting repo identity. Mustfile/Adjustfile/Intentfile/Trustfile all literally described "rsr-template-repo … the master template for all hyperpolymath" and the Mustfile enforced the old nested layout (contractiles/bust/, self-validating/k9-svc/, 6a2/anchors/) as critical — which contradicts the template's own delivered flat layout. echo-types' freshly-standardized 06-12 main carries the same leaked Mustfile. This PR rewrites all four for eclexia, but the template itself should be fixed (identity substitution + flat-layout Mustfile checks). I couldn't file it directly — rsr-template-repo is outside this session's scope.

Scope / non-goals

• Not the full SPDX/REUSE header sweep or the CI campaign C001–C005 from estate-standardization-20260607 — those remain for the estate rollout (or a focused REUSE pass). This PR is the structural-layout + currency layer.
• For eclexia's .machine_readable/ + governance layout, this supersedes estate-standardization-20260607 (and corrects its template leaks).

Reconciliation note

The claude/gallant-faraday-LSAGJ dev branch was rebased onto current main (the Echo/Landauer work already landed via #32/#33; the old tip is preserved under tag backup/eclexia-dev-20260613).

https://claude.ai/code/session_01PWMMxryCcPrAjJ8tuGvygG

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