fix: remove banned V-language v-adapter (route via zig-unified-api-adapter)

[hyperpolymath]

Summary

V-language is banned estate-wide; the sanctioned connector layer is zig-unified-api-adapter. This PR removes the V-language adapter from echidna — the worst single V-lang footprint in the estate (9 live source files).

Changes

Removed src/interfaces/v-adapter/ (9 V source files, all module main):
boj.v, graphql.v, grpc.v, overlay.v, overlay_graphql.v, overlay_grpc.v, rest.v, tentacles.v, typell.v.

Why no wiring changes were needed

The directory was completely unwired:

• Not a Cargo workspace member — Cargo.toml lists only src/interfaces/{graphql,grpc,rest} (plus the crates/*), never v-adapter.
• No mod declaration referencing it anywhere.
• No tracked build file, Justfile, build.rs, or CI workflow references v-adapter/v_adapter.
• src/interfaces/README.md documents only graphql/grpc/rest and contains no v-adapter reference.

git grep for v-adapter/v_adapter across tracked non-data files returns no remaining references after removal. No dangling paths, no // TODO stubs required.

Validation

• Confirmed the 9 files are V source (module main, V syntax), not Coq.
• Post-removal dangling-reference scan: CLEAN.
• cargo build --offline fails on a pre-existing schemars dependency-resolution issue in the unrelated echidna-mcp crate (offline cache miss, not a regression — v-adapter was never a Cargo member so its removal cannot affect the build graph).

🤖 Generated with Claude Code

[github-actions]

🔍 Hypatia Security Scan

Findings: 187 issues detected

Severity	Count
🔴 Critical	37
🟠 High	75
🟡 Medium	75

⚠️ Action Required: Critical security issues found!

View findings

[
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    "reason": "Action haskell-actions/setup@v2 needs attention",
    "type": "unpinned_action",
    "file": "agda-meta-checker.yml",
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    "severity": "medium"
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  {
    "reason": "Action actions/cache@v4 needs attention",
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  {
    "reason": "Action hyperpolymath/panic-attack/.github/workflows/scan-and-report.yml@main needs attention",
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    "rule_module": "workflow_audit",
    "severity": "high"
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  {
    "reason": "Workflow executes remote script directly (curl/wget piped to shell). Download, verify checksum/signature, then execute.",
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    "rule_module": "workflow_audit",
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  {
    "reason": "believe_me undermines formal verification (1 occurrences, CWE-704)",
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    "file": "/home/runner/work/echidna/echidna/src/abi/TypeLLForeign.idr",
    "action": "flag",
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    "reason": "believe_me undermines formal verification (2 occurrences, CWE-704)",
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    "action": "flag",
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    "reason": "believe_me undermines formal verification (1 occurrences, CWE-704)",
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    "reason": "believe_me undermines formal verification (1 occurrences, CWE-704)",
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    "action": "flag",
    "rule_module": "code_safety",
    "severity": "critical"
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  {
    "reason": "believe_me undermines formal verification (1 occurrences, CWE-704)",
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  {
    "reason": "believe_me undermines formal verification (1 occurrences, CWE-704)",
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]

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