chore(Item 11): drop duplicate .md docs (RSR-canonical .adoc retained)

[hyperpolymath]

Day 10 / Item 11 (estate .md->.adoc dedupe). Removes duplicate doc files
where the .adoc counterpart was verified a faithful superset (0 .md-only
content tokens; vocabulary coverage >=93%). The .adoc is the RSR-canonical
format. Inbound links that resolved to the removed file(s) are repointed to
.adoc. No content lost. Audit basis: Estate Debt Recovery Day 10.

[github-actions]

🔍 Hypatia Security Scan

Findings: 18 issues detected

Severity	Count
🔴 Critical	2
🟠 High	6
🟡 Medium	10

⚠️ Action Required: Critical security issues found!

View findings

[
  {
    "reason": "Required file missing",
    "type": "missing",
    "file": "SECURITY.md",
    "action": "create",
    "rule_module": "root_hygiene",
    "severity": "high"
  },
  {
    "reason": "Action actions/checkout@v4 needs attention",
    "type": "unpinned_action",
    "file": "rust-ci.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Action Swatinem/rust-cache@v2 needs attention",
    "type": "unpinned_action",
    "file": "rust-ci.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Action actions/checkout@v4 needs attention",
    "type": "unpinned_action",
    "file": "rust-ci.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Action dtolnay/rust-toolchain@master needs attention",
    "type": "unpinned_action",
    "file": "rust-ci.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "Action Swatinem/rust-cache@v2 needs attention",
    "type": "unpinned_action",
    "file": "rust-ci.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Required file missing (condition: public_repo)",
    "type": "missing_requirement",
    "file": "SECURITY.md",
    "action": "create",
    "rule_module": "cicd_rules",
    "severity": "high"
  },
  {
    "reason": "expect() in hot path (1 occurrences, CWE-754)",
    "type": "expect_in_hot_path",
    "file": "/home/runner/work/verisimiser/verisimiser/src/codegen/ident.rs",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "medium"
  },
  {
    "reason": "unwrap() without prior check -- DoS via panic (1 occurrences, CWE-754)",
    "type": "unwrap_without_check",
    "file": "/home/runner/work/verisimiser/verisimiser/src/codegen/overlay.rs",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "high"
  },
  {
    "reason": "panic! macro causes unrecoverable crash (1 occurrences, CWE-754)",
    "type": "panic_macro",
    "file": "/home/runner/work/verisimiser/verisimiser/src/codegen/overlay.rs",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "high"
  }
]

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