refactor: rename metadata directory .hermes to .mam in backplane scripts and documents

.agents/skills/tmux-agent-orchestrate-delegate-job/registry.md

@@ -15,13 +15,13 @@ Reference implementation: [`./scripts/registry.py`](./scripts/registry.py)
 ## 1. Directory layout
 
 ```
-.hermes/jobs/
+.mam/jobs/
   <job_id>.json          # job metadata record (schema below)
   <job_id>.events.log    # append-only JSON-lines event log (debug, optional)
   .lock                  # shared advisory lock (fcntl) for the whole registry
 ```
 
-`registry_dir` defaults to `.hermes/jobs` and is overridable everywhere via
+`registry_dir` defaults to `.mam/jobs` and is overridable everywhere via
 `--registry-dir`.
 
 ---
@@ -143,13 +143,13 @@ that session.
 ## 7. Persistent audit log
 
 Separate from the registry, every job is also mirrored to a durable append-only
-audit log at `.hermes/delegate_job_logs/<job_id>/` (override with
-`DELEGATE_JOB_LOGS_DIR`, default `<cwd>/.hermes/delegate_job_logs`). The registry
+audit log at `.mam/delegate_job_logs/<job_id>/` (override with
+`DELEGATE_JOB_LOGS_DIR`, default `<cwd>/.mam/delegate_job_logs`). The registry
 is **live state** mutated in place; the audit log is **history** that survives
 even after the registry dir is cleaned up. It is git-ignored.
 
 ```
-.hermes/delegate_job_logs/<job_id>/
+.mam/delegate_job_logs/<job_id>/
   meta.json      # registration snapshot (the full job record at register time)
   events.ndjson  # append-only, one JSON event per line, time-ordered
   status.json    # current status only (fast point-query)