docs(adr): supersede ADR-0011 with ADR-0012 — json-family implemented (V-L2-F3)

[hyperpolymath]

Docs-only reconciliation of a merge race. No code changes.

What happened

While the V-L2-F2 wrap-up (#149, ADR-0011 documenting the json drop) was in flight, the maintainer merged #148 for #146 (V-L2-F3), which deliberately reverses that drop and implements a JSON-family sidecar backend (plain / JSON-LD / NDJSON) with full SQLite-parity octad runtime and a real storage abstraction (sidecar::StorageKind + a format-independent SidecarData codec). #149 merged seconds later, so ADR-0011 / CHANGELOG / README landed on main contradicting the code that #148 had just added.

This PR

• ADR-0012 (new) — documents the V-L2-F3 reversal + implementation; explains how it answers ADR-0011's "no abstraction / relational-only" premise (it introduced the abstraction and re-encodes the invariants in code, with a documented single-writer trade-off).
• ADR-0011 — marked Superseded by ADR-0012, retained as the historical record of the F2 decision (which did ship in feat(manifest): drop unimplemented json sidecar store (V-L2-F2, #112) #144).
• CHANGELOG — the intra-cycle Removed: drop json entry is replaced by an Added: JSON-family sidecar backend entry (the net state for the release).
• README — legacy example now lists sqlite | postgres | json.

Validation

• main (with feat(sidecar): JSON-family storage backend — plain / JSON-LD / NDJSON (V-L2-F3, #146) #148) + these docs: cargo fmt --check, cargo clippy --all-targets -- -D warnings, cargo test (142 pass) all green.
• ADR cross-references consistent (0011 ⇄ 0012); no stale "json dropped" claims remain outside ADR-0011's retained history.

Follows up #112 / #144 / #147 / #149 (V-L2-F2) and #146 / #148 (V-L2-F3).

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[github-actions]

🔍 Hypatia Security Scan

Findings: 82 issues detected

Severity	Count
🔴 Critical	3
🟠 High	7
🟡 Medium	72

⚠️ Action Required: Critical security issues found!

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