Rename agents.md → AGENTS.md; add CLAUDE.md; disable auto-memory

Phase 4a of the distributed-singing-stonebraker plan: foundation commit
for the linuxcnc fork's lazy-loaded, audience-separated context layout.
Mirrors what Phase 3a did for the lab repo.

- git mv agents.md -> AGENTS.md (case rename via two-step temp file so
  case-insensitive filesystems aren't required)
- Create CLAUDE.md containing @AGENTS.md so Claude Code auto-loads
  AGENTS.md via the documented import mechanism on every session
- Set autoMemoryEnabled: false in .claude/settings.json (documented
  setting that disables harness auto-memory). Linuxcnc has 39 entries
  in the auto-memory directory at this work computer; with this flag
  none of them auto-load. In-repo memory/ (Phase 4c) becomes the sole
  source of truth.
- Un-ignore .claude/settings.json specifically (.gitignore changed from
  '.claude/' to '.claude/*' + '!/.claude/settings.json' exception). The
  .claude/settings.local.json file remains gitignored — it's the
  per-developer override slot, never tracked.
- Update the two 'agents.md' references in memory.md to 'AGENTS.md'
  (the only external references to the old filename in the repo).

Content of AGENTS.md is unchanged; Phase 4b will trim and rewrite it
per the plan budgets, mirror the canonical sections from lab/AGENTS.md,
and preserve the existing 'Upstream PR prep' section verbatim.

Author: igor

.claude/settings.json

@@ -0,0 +1,46 @@
+{
+  "autoMemoryEnabled": false,
+  "permissions": {
+    "allow": [
+      "Bash(make:*)",
+      "Bash(git:*)",
+      "Bash(halcmd:*)",
+      "Bash(halrun:*)",
+      "Bash(halcompile:*)",
+      "Bash(linuxcnc:*)",
+      "Bash(python3:*)",
+      "Bash(grep:*)",
+      "Bash(find:*)",
+      "Bash(ls:*)",
+      "Bash(cat:*)",
+      "Bash(head:*)",
+      "Bash(tail:*)",
+      "Bash(wc:*)",
+      "Bash(file:*)",
+      "Bash(which:*)",
+      "Bash(command -v:*)",
+      "Bash(echo:*)",
+      "Bash(env)",
+      "Bash(pgrep:*)",
+      "Bash(dpkg:*)",
+      "Bash(apt-cache:*)",
+      "Bash(apt list:*)",
+      "Bash(mkdir:*)",
+      "Bash(cp:*)",
+      "Bash(chmod:*)",
+      "Bash(sed:*)",
+      "Bash(tar:*)",
+      "Bash(sudo:*)",
+      "Read(//usr/**)",
+      "Read(//tmp/**)",
+      "Read(//proc/**)",
+      "Read(//etc/**)",
+      "Read(//home/igor/**)",
+      "WebFetch(domain:linuxcnc.org)",
+      "WebFetch(domain:forum.linuxcnc.org)"
+    ],
+    "additionalDirectories": [
+      "/tmp"
+    ]
+  }
+}

.gitignore

@@ -57,4 +57,6 @@ position.txt
 *.*-stamp
 # Ignore VSCode settings
 .vscode/settings.json
-.claude/
+.claude/*
+# Exception: project settings like autoMemoryEnabled must reach every cloner
+!/.claude/settings.json

agents.md AGENTS.mdagents.md renamed to AGENTS.md

@@ -0,0 +1 @@
+@AGENTS.md

CLAUDE.md

@@ -3,7 +3,7 @@
 Persistent memory for Claude Code agents working in this fork.
 Update this file as conventions, practices, and learnings evolve.
 
-For step-by-step build/run/test procedures, see [agents.md](agents.md).
+For step-by-step build/run/test procedures, see [AGENTS.md](AGENTS.md).
 For agent-helpers documentation, see [agent-helpers/README.md](agent-helpers/README.md).
 
 ---
@@ -20,7 +20,7 @@ For agent-helpers documentation, see [agent-helpers/README.md](agent-helpers/REA
 - **Use safe-agent-action.sh for ALL operations** — builds, grep, find, git, view, tail, ps, halcmd. The wrapper auto-cd's to repo root and is pre-approved via a global PreToolUse hook.
 - **Extend the wrapper, don't fall back to bare bash** — if a subcommand is missing, add it to `safe-agent-action.sh`. New subcommands are auto-approved (the hook matches the script name).
 - **Never use bare `make` in `src/`** — the wrapper handles setuid restore automatically.
-- Keep agent instructions in [agents.md](agents.md) — committed to the fork, not local
+- Keep agent instructions in [AGENTS.md](AGENTS.md) — committed to the fork, not local
 - Keep project memory in this file — committed to the fork, not local
 - Runtime-generated config files (`.pref`, `qtvcp/`) are excluded via `.git/info/exclude`