Builtins and instruction context become ordinary Location-scoped
services exposing load(), the same shape as skill, reference, and MCP
guidance. The runner composes all six producers explicitly in
loadSystemContext, so the full context roster is readable at one call
site. Dynamic registration and scoped deregistration had no consumers.
Reconcile never rewrites the baseline; only rebaseline (compaction) and
initialize (first turn) produce baseline text. The durable Applied record
tracks what the model was last told, per source.
- Incompatible stored values re-announce the source baseline as an update
instead of forcing a full replacement
- Sources removed without removal text retain the model's belief silently;
entries self-clean at the next rebaseline
- Rebaseline restates unobservable sources from their last-applied values
instead of blocking; ReplacementBlocked and ReplacementReady are gone
- Rename Snapshot to Applied and Generation to Baseline {text, applied}
