Add DMN-style decision tables

[JE-Chen]

Workflow batch (from multi-agent web research; verified absent). Full layers + tests + EN/Zh v53 docs + README.

Feature (utils/decision_table, pure-stdlib)

• evaluate_table / DecisionTable: externalize branching into rows of conditions -> outputs with a hit policy (UNIQUE/FIRST/PRIORITY/COLLECT) — the DMN alternative to nested AC_if_var. Cell conditions are wildcard (None/-/*), literal (equality), or {op, value} reusing the executor's standard comparators (eq/ne/lt/le/gt/ge/contains/startswith/endswith — imported, not duplicated).
• Executor AC_decision_table (spec/context dict or JSON string); MCP ac_decision_table; Builder under Flow.

Verification

• 10 tests pass (first-match, no-match empty, COLLECT all, UNIQUE multi-raises, wildcard+literal, unknown-op raises, direct class API, executor round-trip, wiring, facade); ruff clean; radon no CC≥C; bandit clean; PySide6-free.

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

View in Codacy

🟢 Metrics 37 complexity · 0 duplication

Metric	Results
Complexity	37
Duplication	0

View in Codacy

_{NEW Get contextual insights on your PRs based on Codacy's metrics, along with PR and Jira context, without leaving GitHub. Enable AI reviewer
TIP This summary will be updated as you push new changes.}

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud