CLI improvements: --json output, filters, arch-search, ecal-score, deck fixes

6 CLI improvements from MCP integration testing + deck bug fixes:

- kb_cli.py: --json on search, new arch-search and ecal-score subcommands,
  _load_yaml handles multi-document YAML (fixes health command on 32 files)
- findings_cli.py: --json on search/list/stats, filter flags on search
  (--product, --severity, --tag, --client, --status, --category)
- validate-architecture.py: --profile optional, --output defaults to stdout
- common-objections.yaml + ecal-artefacts-catalog.yaml: merge front matter
- oci_deck_gen.py: fix slide 9 cost_notes char iteration, fix slide 12
  migration field mapping (duration/milestones), dynamic phase spacing
- proposal-spec.yaml: replace real name with fictional Carlos Mendoza

All 14 skill options validated with generated deliverables.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

examples/output-cli-improvements-deliverables/findings-stats.json

@@ -0,0 +1,26 @@
+{
+  "total": 8,
+  "by_severity": {
+    "HIGH": 2,
+    "MEDIUM": 4,
+    "LOW": 1,
+    "INFO": 1
+  },
+  "by_product": {
+    "ADB-S": 4,
+    "OCI CLI": 1,
+    "ADB-S Dedicated Elastic Pool (DEP)": 2,
+    "OCI DMS": 1
+  },
+  "by_status": {
+    "acknowledged": 5,
+    "open": 2,
+    "monitoring": 1
+  },
+  "by_category": {
+    "limitation": 3,
+    "bug": 1,
+    "undocumented": 1,
+    "gotcha": 3
+  }
+}