feat: automate community catalog submissions with validation and PR generation

Add GitHub Actions workflows and scripts to automate extension and preset
catalog submissions. Validation is metadata-only (no archive extraction).

- catalog-validate.yml: auto-validates submission issues
- catalog-pr.yml: generates PR to update catalog.community.json
- catalog-validate.py: issue parsing, field validation, URL reachability
- catalog-pr.py: catalog entry generation and PR creation
- catalog-generate-table.py: formatted catalog table generation
- Updated publishing/development guides
- New presets/DEVELOPING.md

Closes #2400

Author: mnriem

.github/CODEOWNERS

@@ -1,3 +1,8 @@
 # Global code owner
 * @mnriem
 
+# Community catalog files — require maintainer approval even for bot PRs
+extensions/catalog.community.json @mnriem
+integrations/catalog.community.json @mnriem
+presets/catalog.community.json @mnriem
+

.github/scripts/catalog-generate-table.py

@@ -0,0 +1,194 @@
+#!/usr/bin/env python3
+"""Generate a markdown table from a community catalog JSON file.
+
+Reads a catalog.community.json and replaces content between marker comments
+in a target markdown file.  If the markers are not present the table is
+printed to stdout.
+
+Markers expected in the markdown file:
+    <!-- catalog-table-start -->
+    ... (old table content replaced) ...
+    <!-- catalog-table-end -->
+
+Usage:
+    python .github/scripts/catalog-generate-table.py \
+        --catalog presets/catalog.community.json \
+        --type preset \
+        --target docs/community/presets.md
+"""
+
+from __future__ import annotations
+
+import argparse
+import json
+import re
+import sys
+from pathlib import Path
+
+START_MARKER = "<!-- catalog-table-start -->"
+END_MARKER = "<!-- catalog-table-end -->"
+
+
+# ---------------------------------------------------------------------------
+# Table builders — one per catalog type
+# ---------------------------------------------------------------------------
+
+def _repo_display_name(url: str) -> str:
+    """Extract the repository name from a GitHub URL."""
+    # https://github.com/user/spec-kit-foo  →  spec-kit-foo
+    return url.rstrip("/").rsplit("/", 1)[-1]
+
+
+def _provides_str_preset(provides: dict) -> str:
+    parts: list[str] = []
+    t = provides.get("templates", 0)
+    c = provides.get("commands", 0)
+    s = provides.get("scripts", 0)
+    if t:
+        parts.append(f"{t} template{'s' if t != 1 else ''}")
+    if c:
+        parts.append(f"{c} command{'s' if c != 1 else ''}")
+    if s:
+        parts.append(f"{s} script{'s' if s != 1 else ''}")
+    return ", ".join(parts) or "—"
+
+
+def _requires_str_preset(requires: dict) -> str:
+    exts = requires.get("extensions", [])
+    if exts:
+        return ", ".join(f"{e} extension" for e in exts)
+    return "—"
+
+
+def build_preset_table(catalog: dict) -> str:
+    """Build a markdown table for presets."""
+    entries = catalog.get("presets", {})
+    lines: list[str] = []
+    lines.append("| Preset | Purpose | Provides | Requires | URL |")
+    lines.append("|--------|---------|----------|----------|-----|")
+
+    for _id in sorted(entries):
+        e = entries[_id]
+        name = e.get("name", _id)
+        desc = e.get("description", "")
+        provides = _provides_str_preset(e.get("provides", {}))
+        requires = _requires_str_preset(e.get("requires", {}))
+        repo_url = e.get("repository", "")
+        repo_name = _repo_display_name(repo_url)
+        lines.append(
+            f"| {name} | {desc} | {provides} | {requires} "
+            f"| [{repo_name}]({repo_url}) |"
+        )
+
+    return "\n".join(lines)
+
+
+def _provides_str_extension(provides: dict) -> str:
+    parts: list[str] = []
+    c = provides.get("commands", 0)
+    h = provides.get("hooks", 0)
+    if c:
+        parts.append(f"{c} command{'s' if c != 1 else ''}")
+    if h:
+        parts.append(f"{h} hook{'s' if h != 1 else ''}")
+    return ", ".join(parts) or "—"
+
+
+def build_extension_table(catalog: dict) -> str:
+    """Build a markdown table for extensions."""
+    entries = catalog.get("extensions", {})
+    lines: list[str] = []
+    lines.append("| Extension | Purpose | Provides | URL |")
+    lines.append("|-----------|---------|----------|-----|")
+
+    for _id in sorted(entries):
+        e = entries[_id]
+        name = e.get("name", _id)
+        desc = e.get("description", "")
+        provides = _provides_str_extension(e.get("provides", {}))
+        repo_url = e.get("repository", "")
+        repo_name = _repo_display_name(repo_url)
+        lines.append(
+            f"| {name} | {desc} | {provides} "
+            f"| [{repo_name}]({repo_url}) |"
+        )
+
+    return "\n".join(lines)
+
+
+BUILDERS = {
+    "preset": build_preset_table,
+    "extension": build_extension_table,
+}
+
+
+# ---------------------------------------------------------------------------
+# File updater
+# ---------------------------------------------------------------------------
+
+def update_file(path: Path, table: str) -> bool:
+    """Replace content between markers in *path*.  Returns True if updated."""
+    content = path.read_text()
+
+    pattern = re.compile(
+        rf"({re.escape(START_MARKER)})\n.*?\n({re.escape(END_MARKER)})",
+        re.DOTALL,
+    )
+
+    if not pattern.search(content):
+        return False
+
+    new_content = pattern.sub(rf"\1\n{table}\n\2", content)
+
+    if new_content != content:
+        path.write_text(new_content)
+        return True
+    return False
+
+
+# ---------------------------------------------------------------------------
+# Main
+# ---------------------------------------------------------------------------
+
+def main() -> None:
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument(
+        "--catalog", required=True,
+        help="Path to catalog.community.json",
+    )
+    parser.add_argument(
+        "--type", required=True, choices=list(BUILDERS),
+        help="Catalog type",
+    )
+    parser.add_argument(
+        "--target",
+        help="Markdown file to update (must contain marker comments)",
+    )
+    args = parser.parse_args()
+
+    with open(args.catalog) as f:
+        catalog = json.load(f)
+
+    builder = BUILDERS[args.type]
+    table = builder(catalog)
+
+    if args.target:
+        target = Path(args.target)
+        if not target.exists():
+            print(f"Error: target file not found: {target}", file=sys.stderr)
+            sys.exit(1)
+        if update_file(target, table):
+            print(f"Updated {target}")
+        else:
+            print(
+                f"Warning: markers {START_MARKER} / {END_MARKER} not found "
+                f"in {target}. Printing table to stdout.",
+                file=sys.stderr,
+            )
+            print(table)
+    else:
+        print(table)
+
+
+if __name__ == "__main__":
+    main()

.github/scripts/catalog-pr.py

@@ -0,0 +1,138 @@
+#!/usr/bin/env python3
+"""Update a community catalog JSON file with a validated entry.
+
+Reads the validation result and entry produced by catalog-validate.py,
+inserts or replaces the entry in the catalog, sorts entries alphabetically,
+and optionally regenerates a docs table.
+
+Usage (typically called from GitHub Actions):
+    python .github/scripts/catalog-pr.py \
+        --catalog extensions/catalog.community.json \
+        --type extension
+
+    python .github/scripts/catalog-pr.py \
+        --catalog presets/catalog.community.json \
+        --type preset \
+        --table-target docs/community/presets.md
+
+Environment variables:
+    GITHUB_OUTPUT   — Path to GitHub Actions output file (optional)
+
+Inputs (files produced by catalog-validate.py):
+    /tmp/validation-result.json  — metadata including item_id, valid, is_update
+    /tmp/catalog-entry.json      — the entry to insert/replace
+"""
+
+from __future__ import annotations
+
+import argparse
+import json
+import os
+import subprocess
+import sys
+from datetime import datetime, timezone
+from pathlib import Path
+
+CATALOG_KEY = {
+    "extension": "extensions",
+    "preset": "presets",
+}
+
+
+def main() -> None:
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument(
+        "--catalog", required=True,
+        help="Path to the catalog JSON file",
+    )
+    parser.add_argument(
+        "--type", required=True, choices=list(CATALOG_KEY),
+        help="Catalog type",
+    )
+    parser.add_argument(
+        "--result", default="/tmp/validation-result.json",
+        help="Path to validation result JSON",
+    )
+    parser.add_argument(
+        "--entry", default="/tmp/catalog-entry.json",
+        help="Path to catalog entry JSON",
+    )
+    parser.add_argument(
+        "--table-target",
+        help="Markdown file to regenerate table in (must contain marker comments)",
+    )
+    args = parser.parse_args()
+
+    # Load validation result
+    result_path = Path(args.result)
+    if not result_path.exists():
+        print(f"Error: result file not found: {result_path}", file=sys.stderr)
+        sys.exit(2)
+    result = json.loads(result_path.read_text())
+
+    if not result.get("valid"):
+        print("Submission is not valid — skipping catalog update.")
+        _set_output("skipped", "true")
+        sys.exit(0)
+
+    # Load entry
+    entry_path = Path(args.entry)
+    if not entry_path.exists():
+        print(f"Error: entry file not found: {entry_path}", file=sys.stderr)
+        sys.exit(2)
+    new_entry = json.loads(entry_path.read_text())
+
+    item_id = result["item_id"]
+    is_update = result.get("is_update", False)
+    cat_key = CATALOG_KEY[args.type]
+
+    # Update catalog
+    catalog_path = Path(args.catalog)
+    with open(catalog_path) as f:
+        catalog = json.load(f)
+
+    catalog[cat_key][item_id] = new_entry
+    catalog["updated_at"] = datetime.now(timezone.utc).strftime("%Y-%m-%dT00:00:00Z")
+    catalog[cat_key] = dict(sorted(catalog[cat_key].items()))
+
+    with open(catalog_path, "w") as f:
+        json.dump(catalog, f, indent=2)
+        f.write("\n")
+
+    print(f"Updated {catalog_path}: {'replaced' if is_update else 'added'} {item_id}")
+
+    # Regenerate docs table if requested
+    if args.table_target:
+        table_script = Path(__file__).parent / "catalog-generate-table.py"
+        subprocess.run(
+            [
+                sys.executable, str(table_script),
+                "--catalog", args.catalog,
+                "--type", args.type,
+                "--target", args.table_target,
+            ],
+            check=True,
+        )
+
+    # Set outputs for the workflow
+    action = "update" if is_update else "add"
+    _set_output("skipped", "false")
+    _set_output("item_id", item_id)
+    _set_output("is_update", str(is_update).lower())
+    _set_output("action", action.title())
+    _set_output("action_verb", f"{action.title()}s")
+    _set_output("branch", f"community/{action}-{args.type}-{item_id}")
+
+
+def _set_output(name: str, value: str) -> None:
+    """Write a GitHub Actions output variable."""
+    gh_output = os.environ.get("GITHUB_OUTPUT")
+    if gh_output:
+        with open(gh_output, "a") as f:
+            f.write(f"{name}={value}\n")
+    # Also print for local debugging
+    print(f"  output: {name}={value}")
+
+
+if __name__ == "__main__":
+    main()