chore(agents): add "Git workflow (every task)" rule to all agents + skills

Bakes the branching discipline into the team so it's followed automatically:
at the start of a new task, ask the user to commit + push any unpushed work,
then branch off main and build the feature on the new branch (never commit to
main), commit + push at the end. Mid-chain auto-spawned agents and read-only
agents (reviewer/verifier/security) stay on the task's branch and don't
re-branch, leaving the final commit to the task owner.

Appended one identical "## Git workflow (every task)" section to all 11
.claude/agents/*.md and all 11 .claude/skills/*/SKILL.md (22 files). Docs/
tooling only (.claude/ is not in the built app) — no version bump / CHANGELOG.

principal artifact + INDEX line; verifier PASS (all 22 blocks byte-identical,
frontmatter intact, scope limited to .claude + audit files, mid-chain clause
behaviorally sound).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VEsaHQx8cXr1hFrKU42UK6

claude_artifacts/verifier-log.md

@@ -18,3 +18,4 @@
 - 2026-08-29 11:20 · devops · SSH NAS host → mycloud.dp.ua:2323 · VERDICT: PASS · re-ran: grep 192.168.50.2 (only comment+artifact), grep NAS_HOST (all mycloud), bash -n push-to-nas.sh OK · probed: all ssh/scp/rsync hops use $NAS_HOST not hardcoded IP; port 2323 preserved; illustrative comment+historical artifact intentional · PASS
 - 2026-08-29 12:07 · engineer · Insights alert/watch sections as accordions · VERDICT: PASS · re-ran: tsc -p (clean), vite build (139 modules, exit 0), grep compiled CSS (.grid[hidden]{display:none} present, specificity/order beats .grid), token defs in globals.scss · probed: collapse hides grid via hidden+override; aria-controls id always-rendered (no dangling ref when collapsed); unique slugs alert-categories/watch-list (no dup id); per-card open state diff-unchanged (no regression); chevron rotate(90deg) bound to aria-expanded=true · PASS
 - 2026-08-29 12:23 · designer/engineer · Insights full-width accordion items (CSS) · VERDICT: PASS · re-ran: vite build OK, tsc clean, npm test 9/9 (client 6 + root 3), grepped dist CSS · probed: section hidden-collapse specificity (.grid[hidden] 0,2,0 beats .grid 0,1,0 → display:none wins), flex-column full-width via default align-items:stretch, .row internal grid columns intact + tokens compile (sass would error if undefined) · PASS
+- 2026-08-29 12:31 · docwriter/tooling · git-workflow rule appended to 22 agent+skill files · VERDICT: PASS · re-ran: grep -c=1 all 22; md5 of each block → 22 identical; head-1=--- x22, tail-1 identical x22; git branch -a (no master, default main); porcelain=22 targets+INDEX+artifact only · probed: mid-chain re-branch clause (exempts reviewer/verifier/security — holds), master→main mapping (no master branch — correct), block-drift/frontmatter-corruption (none) · PASS