session-memory Phase 0: ingest cursor + sweep entrypoint + config (T06)

- session_memory/core/cursor.py: size/mtime change detection sidecar
- session_memory/config.toml: store paths, retention caps, per-source
  globs (claude on, codex/grok off for Phase 1), repo->domain map
- session_memory/ingest.py: discover->normalize->store->digest->evict;
  --dry-run creates/writes nothing; python -m session_memory.ingest
- tests/test_ingest.py; live dry-run parsed 84/85 real local sessions

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

session_memory/config.toml

@@ -0,0 +1,39 @@
+# Coding Session Memory — configuration (design §5.1, §8).
+# Paths support ~ expansion. Edit caps to taste; see docs/DESIGN-session-memory.md.
+
+[store]
+# Local store lives under the repo by default (gitignored).
+db_path   = "session_memory/.store/mem.db"
+blob_dir  = "session_memory/.store/blobs"
+cursor    = "session_memory/.store/cursors.json"
+
+[retention]
+raw_soft_cap_bytes  = 4294967296   # 4 GiB — begin evicting analyzed sessions above this
+raw_hard_cap_bytes  = 6442450944   # 6 GiB — absolute Tier 1 ceiling
+raw_max_age_days    = 45           # backstop: analyzed raw older than this is evictable
+distilled_cap_bytes = 1073741824   # 1 GiB — Tier 2 ceiling (alert, never auto-drop)
+cadence             = "daily"      # sweep trigger: daily | weekly | on-hook
+
+[sources.claude]
+enabled = true
+root    = "~/.claude/projects"
+# glob, relative to root; covers sessions and agent-* sidechains
+glob    = "*/*.jsonl"
+
+# Codex / Grok adapters land in Phase 1 (schemas confirmed in the design doc).
+[sources.codex]
+enabled = false
+root    = "~/.codex/sessions"
+glob    = "*/*/*/rollout-*.jsonl"
+
+[sources.grok]
+enabled = false
+root    = "~/.grok/sessions"
+glob    = "*/*/chat_history.jsonl"
+
+# cwd basename -> domain slug. Used to tag sessions with their Custodian domain.
+[repo_domain_map]
+agentic-resources = "helix_forge"
+the-custodian     = "custodian"
+state-hub         = "custodian"
+ops-bridge        = "custodian"