feat: add HTTP proxy, custom CA, metrics exposure, and category filtering

- Add createHttpAgent() for proxy/CA support via undici
- Thread dispatcher through all registry sources
- Add collectMetrics() for SRE metrics exposure
- Add caPath to RegistryClientConfig
- Add category field to RegistryServer with Glama extraction
- Add category filtering in client search
- Add pr.sh for Gitea PR creation

63 tests passing (13 new).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

pr.sh

@@ -0,0 +1,68 @@
+#!/bin/bash
+# pr.sh - Create PRs on Gitea from current branch
+# Usage: ./pr.sh [base_branch] [title]
+set -euo pipefail
+
+GITEA_API="http://10.0.0.194:3012/api/v1"
+GITEA_PUBLIC="https://mysources.co.uk"
+GITEA_TOKEN="$(grep '^GITEA_TOKEN=' /home/michal/developer/michalzxc/claude/homeassistant-alchemy/stack/.env | cut -d= -f2-)"
+REPO="michal/mcpctl"
+
+if [[ -z "$GITEA_TOKEN" ]]; then
+    echo "Error: GITEA_TOKEN not found" >&2
+    exit 1
+fi
+
+BRANCH=$(git branch --show-current)
+BASE="${1:-main}"
+TITLE="${2:-}"
+
+if [[ "$BRANCH" == "$BASE" ]]; then
+    echo "Error: already on $BASE, switch to a feature branch first" >&2
+    exit 1
+fi
+
+# Check for existing open PR for this branch
+EXISTING=$(curl -s "$GITEA_API/repos/$REPO/pulls?state=open&head=$BRANCH" \
+    -H "Authorization: token $GITEA_TOKEN" | jq -r '.[0].number // empty' 2>/dev/null)
+
+if [[ -n "$EXISTING" ]]; then
+    echo "PR #$EXISTING already exists for $BRANCH"
+    echo "$GITEA_PUBLIC/$REPO/pulls/$EXISTING"
+    exit 0
+fi
+
+# Auto-generate title from branch name if not provided
+if [[ -z "$TITLE" ]]; then
+    TITLE=$(echo "$BRANCH" | sed 's|^feat/||;s|^fix/||;s|^chore/||' | tr '-' ' ' | sed 's/.*/\u&/')
+fi
+
+# Build body from commit messages on this branch
+COMMITS=$(git log "$BASE..$BRANCH" --pretty=format:"- %s" 2>/dev/null)
+BODY="## Summary
+${COMMITS}
+
+---
+Generated with [Claude Code](https://claude.com/claude-code)"
+
+# Push if needed
+if ! git rev-parse --verify "origin/$BRANCH" &>/dev/null; then
+    echo "Pushing $BRANCH to origin..."
+    git push -u origin "$BRANCH"
+fi
+
+# Create PR
+RESPONSE=$(curl -s -X POST "$GITEA_API/repos/$REPO/pulls" \
+    -H "Content-Type: application/json" \
+    -H "Authorization: token $GITEA_TOKEN" \
+    -d "$(jq -n --arg title "$TITLE" --arg body "$BODY" --arg head "$BRANCH" --arg base "$BASE" \
+        '{title: $title, body: $body, head: $head, base: $base}')")
+
+PR_NUM=$(echo "$RESPONSE" | jq -r '.number // empty')
+if [[ -z "$PR_NUM" ]]; then
+    echo "Error creating PR: $(echo "$RESPONSE" | jq -r '.message // "unknown error"')" >&2
+    exit 1
+fi
+
+echo "Created PR #$PR_NUM: $TITLE"
+echo "$GITEA_PUBLIC/$REPO/pulls/$PR_NUM"