Auto-refresh KB pricing, align skill with Anthropic best practices

Why this set of changes:
- KB pricing was drifting silently — domain files (database.yaml,
  storage.yaml, etc.) had prices 30-800% off the live Oracle API and
  nobody read them. The skill was auditing as stale on every check
  with no path to fix it.
- The skill itself violated Anthropic's spec (`name` field had
  uppercase/spaces) and was over the 500-line guideline (647 lines),
  hurting discovery and load performance.
- Welcome flow occasionally improvised the menu instead of reading
  SKILL.md, missing options.

Pricing — single source of truth, fully automated:
- Extend tools/refresh_sku_catalog.py with --refresh-domain compute,
  pulls shape-level prices from the Oracle public pricing API
  (apexapps.oracle.com), preserves manual fields (notes, GPU specs,
  free-tier annotations, estimation_helpers), recomputes derived
  monthly values, and protects $0 free-tier prices from overwrite.
- Delete 12 redundant pricing/<domain>.yaml files. They duplicated
  oci-sku-catalog.yaml with worse abstractions and were nobody's
  source of truth (no tool consumed them).
- Migrate the genuinely valuable knowledge from those 12 files
  (billing models, BYOL rules, free-tier rules, ECPU vs OCPU,
  X11M elastic model, hyperscaler comparisons, service nuances)
  into kb/field-knowledge/pricing-knowledge.yaml — non-numeric,
  no refresh needed.
- Result: pricing freshness check goes from 13 stale files to 0.

KB freshness automation:
- Add tools/kb_freshness.py — wrapper around kb_linter.check_freshness()
  with --check, --auto-refresh, --json, --quiet modes. Bridges stale
  files to their refresh tools (SKU catalog, compute domain, arch
  center). Wired into the welcome flow as a pre-flight banner that
  asks the user before refreshing.
- Fix pre-existing kb_linter bug: it crashed on the 45 multi-doc
  YAML files (frontmatter + body pattern) because it used safe_load
  instead of safe_load_all. Freshness check was effectively dead.
- Standardize timestamp field: linter now accepts last_verified,
  last_updated, and last_refreshed; refresh_arch_catalog writes
  last_verified instead of last_refreshed.
- Add make freshness / make freshness-refresh targets.

Skill alignment with Anthropic Agent Skills best practices:
- Rename `name: OCI Deal Accelerator` to `oci-deal-accelerator`
  to comply with the [a-z0-9-]{1,64} spec.
- Refactor SKILL.md from 674 to 445 lines via progressive disclosure:
  extract WA review output format, ECAL readiness format, and output
  conventions into docs/skill/*.md referenced from the main file.
- Add scripts/sync-skill.py + make sync-skill: source of truth is
  root SKILL.md, .agents/skills/oci-deal-accelerator/SKILL.md is
  auto-generated. make lint validates sync.
- Add evaluations/ with 3 manual baseline scenarios (welcome-flow,
  full-proposal, wa-review) per the Anthropic best-practices guidance
  to "build evaluations first."

Welcome flow hardening:
- Tighten CLAUDE.md to MANDATE reading SKILL.md before showing the
  menu (no improvising), and document the freshness pre-flight check
  with the ask-before-refresh user flow.
- Update SKILL.md welcome flow to instruct: parse kb_freshness JSON,
  show banner with stale count + oldest file, prompt user to refresh
  (only when an automated tool exists), fall back silently on errors.

Linter hygiene (zero remaining issues):
- Expand config/kb-tags.yaml taxonomy with features, operations,
  metrics, limitations sections covering 31 previously-unknown tags
  used in field findings (rac, ecpu, refreshable-clone, hnsw, etc.).
- Assign owners for kb/compatibility/, kb/competitive/,
  kb/well-architected/ (Diego Cabrera as default until team grows);
  kb/pricing/ marked as "Auto-refreshed" since it no longer needs
  human ownership.
- kb_linter accepts top-level `date` as fallback for contributor
  block; migrate FF-202603-008 from legacy `reported_by` to
  contributor block.
- Result: linter goes from 45 issues to 0.

Other:
- Recompute estimation_helpers monthly values in compute.yaml after
  the price refresh (they were derived from the old E5/A1 numbers).
- Add kb/README.md — contributor guide (directory map, frontmatter
  spec, refresh tooling, review cadence).

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

scripts/sync-skill.py

@@ -0,0 +1,82 @@
+#!/usr/bin/env python3
+"""
+Sync SKILL.md (root, source of truth) to .agents/skills/oci-deal-accelerator/SKILL.md.
+
+The Codex copy under .agents/ must be byte-identical to the root SKILL.md
+except for an auto-generated banner inserted after the YAML frontmatter.
+
+Usage:
+    python scripts/sync-skill.py            # write the .agents/ copy
+    python scripts/sync-skill.py --check    # exit 1 if out of sync (for CI/lint)
+"""
+
+import argparse
+import os
+import sys
+
+PROJECT_ROOT = os.path.dirname(os.path.dirname(os.path.realpath(__file__)))
+SOURCE = os.path.join(PROJECT_ROOT, "SKILL.md")
+TARGET = os.path.join(
+    PROJECT_ROOT, ".agents", "skills", "oci-deal-accelerator", "SKILL.md"
+)
+
+BANNER = (
+    "<!-- AUTO-GENERATED FROM /SKILL.md — do not edit directly. "
+    "Run `python scripts/sync-skill.py` to regenerate. -->\n"
+)
+
+
+def render() -> str:
+    """Read root SKILL.md and return the .agents/ version with banner injected."""
+    with open(SOURCE, "r", encoding="utf-8") as fh:
+        content = fh.read()
+
+    # Inject banner after the closing `---` of the YAML frontmatter, if present.
+    if content.startswith("---\n"):
+        end = content.find("\n---\n", 4)
+        if end != -1:
+            head = content[: end + len("\n---\n")]
+            tail = content[end + len("\n---\n") :]
+            return head + "\n" + BANNER + tail
+
+    # No frontmatter — prepend banner.
+    return BANNER + content
+
+
+def cmd_check() -> int:
+    expected = render()
+    if not os.path.isfile(TARGET):
+        print(f"sync-skill: target missing: {TARGET}")
+        return 1
+    with open(TARGET, "r", encoding="utf-8") as fh:
+        actual = fh.read()
+    if actual == expected:
+        print("sync-skill: OK (in sync)")
+        return 0
+    print("sync-skill: OUT OF SYNC")
+    print(f"  source: {SOURCE}")
+    print(f"  target: {TARGET}")
+    print("  run: python scripts/sync-skill.py")
+    return 1
+
+
+def cmd_write() -> int:
+    expected = render()
+    os.makedirs(os.path.dirname(TARGET), exist_ok=True)
+    with open(TARGET, "w", encoding="utf-8") as fh:
+        fh.write(expected)
+    print(f"sync-skill: wrote {os.path.relpath(TARGET, PROJECT_ROOT)} "
+          f"({len(expected.splitlines())} lines)")
+    return 0
+
+
+def main() -> int:
+    parser = argparse.ArgumentParser(description="Sync root SKILL.md to .agents/")
+    parser.add_argument("--check", action="store_true",
+                        help="Exit 1 if out of sync; do not write.")
+    args = parser.parse_args()
+    return cmd_check() if args.check else cmd_write()
+
+
+if __name__ == "__main__":
+    sys.exit(main())