fix(parser): remove 16 dead precedence declarations [#215 family F]

[hyperpolymath]

fix(parser): remove dead precedence declarations [#215 family F]

Menhir emitted 16 "precedence level / %prec ... never useful"
warnings — declarations that never resolve any conflict because the
expression cascade disambiguates structurally. They are pure noise
that, alongside the conflict warnings, make a healthy build look
broken.

Removed (all certified "never useful" by Menhir itself):

• precedence level: %right EQ PLUSEQ MINUSEQ STAREQ SLASHEQ
  (assignment ops — handled at statement level, never in the
  expr operator cascade)
• precedence level: %right BANG TILDE UMINUS UREF UDEREF
  (unary level — expr_unary is right-recursive and already
  unambiguous)
• precedence level: %left DOT LBRACKET LPAREN
  (postfix level — expr_postfix disambiguates structurally)
• the three now-orphaned %prec UMINUS/UREF/UDEREF on the unary
  rules (UMINUS/UREF/UDEREF were pseudo-tokens used only there)

Provably parse-behaviour-neutral — removing a declaration Menhir
certifies resolves nothing cannot change any resolution. Verified:

• 16 "never useful" warnings: gone (0 remain)
• conflict counts UNCHANGED: 72 S/R, 10 R/R, 23 S/R states,
  4 R/R states (identical resolution profile)
• dune test --force green at 257/257

The retained LOWEST_TYPE_ARROW/ARROW levels (#216, family A) are
not flagged — they do real work.

Refs #215

Co-Authored-By: Claude Opus 4.7 (1M context) noreply@anthropic.com

[github-actions]

🔍 Hypatia Security Scan

Findings: 44 issues detected

Severity	Count
🔴 Critical	12
🟠 High	21
🟡 Medium	11

⚠️ Action Required: Critical security issues found!

View findings

[
  {
    "reason": "Stray AI.a2ml in root -- use 0-AI-MANIFEST.a2ml only",
    "type": "banned",
    "file": "AI.a2ml",
    "action": "delete",
    "rule_module": "root_hygiene",
    "severity": "high"
  },
  {
    "reason": "Superseded by 0-AI-MANIFEST.a2ml",
    "type": "banned",
    "file": "AI.djot",
    "action": "delete",
    "rule_module": "root_hygiene",
    "severity": "high"
  },
  {
    "reason": "Issue in quality.yml",
    "type": "missing_workflow",
    "file": "quality.yml",
    "action": "create",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "Issue in security-policy.yml",
    "type": "missing_workflow",
    "file": "security-policy.yml",
    "action": "create",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Action hyperpolymath/standards/.github/workflows/governance-reusable.yml@main needs attention",
    "type": "unpinned_action",
    "file": "governance.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "TypeScript file detected -- banned language",
    "type": "banned_language_file",
    "file": "/home/runner/work/affinescript/affinescript/affinescript-deno-test/example/smoke_driver.ts",
    "action": "flag",
    "rule_module": "cicd_rules",
    "severity": "critical"
  },
  {
    "reason": "TypeScript file detected -- banned language",
    "type": "banned_language_file",
    "file": "/home/runner/work/affinescript/affinescript/affinescript-deno-test/cli.ts",
    "action": "flag",
    "rule_module": "cicd_rules",
    "severity": "critical"
  },
  {
    "reason": "TypeScript file detected -- banned language",
    "type": "banned_language_file",
    "file": "/home/runner/work/affinescript/affinescript/affinescript-deno-test/mod.ts",
    "action": "flag",
    "rule_module": "cicd_rules",
    "severity": "critical"
  },
  {
    "reason": "TypeScript file detected -- banned language",
    "type": "banned_language_file",
    "file": "/home/runner/work/affinescript/affinescript/affinescript-deno-test/lib/compile.ts",
    "action": "flag",
    "rule_module": "cicd_rules",
    "severity": "critical"
  },
  {
    "reason": "TypeScript file detected -- banned language",
    "type": "banned_language_file",
    "file": "/home/runner/work/affinescript/affinescript/affinescript-deno-test/lib/runner.ts",
    "action": "flag",
    "rule_module": "cicd_rules",
    "severity": "critical"
  }
]

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