docs(integrations): decision-sink demo — run the cpex#166 seam end-to-end and print the OCSF records

[Levaj2000]

Makes the CPEX ↔ audit-seam ↔ plugin integration (#456/#457, cpex#166) visibly runnable in one command.

What it adds

examples/decision_sink_demo.rs — builds a sink-mode emitter (no hooks:, so it attaches as an AuditHandler exactly as in production), feeds it four finalized DecisionLogs the way the executor would (ordered steps, terminal verdict, span, (epoch, stream_id, stream_seq, emission_seq) stamps), and pretty-prints the resulting OCSF records:

1. Clean allow → action: Allowed / disposition: Allowed
2. Allow after modification → action: Modified (never re-coded as a plain allow)
3. Deny → action: Denied / disposition: Blocked, violation at status_code/status_detail — the record a post-hook observer can never produce
4. Suppressed deny + aborted branch → flat deny_ignored: true flag plus per-step deny_ignored/aborted actions — "every suppressed transform deny" as one SIEM query

Deterministic timestamps and stream stamps, mirroring emit_sample (which remains the dispatch-half demo: hash chain + DSSE verification).

Verified live before this PR

• cpex cloned at the verified seam revision feat/audit-seam @ 386710a, rustc 1.96 (MSRV pin honored)
• cargo test: 32/32 green
• cargo run --example decision_sink_demo and cargo run --example emit_sample both produce the expected output (chain checks and DSSE verification all true)

Run it

rustup toolchain install 1.96 && rustup default 1.96
git clone -b feat/audit-seam https://github.com/contextforge-org/cpex ../cpex && git -C ../cpex checkout 386710a
cd integrations/cpex-ocsf-audit
cargo test && cargo run --example decision_sink_demo

Docs/demo only — no product code changes. CHANGELOG entry included.

🤖 Generated with Claude Code

https://claude.ai/code/session_0112fqxp71zJFg7ENqUoSGEA

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