merge: absorb main into next — 23-commit divergence (08-05..13 base=main window)

17 content commits + 3 merge bubbles were genuinely missing from next (~8,000 lines:
goal controller #1152, framework enforcement #1174/#1195, pr-edit wrapper #1173/#1200,
pipefail series #1100/#1105/#1106/#1107, git-tools fixes #1073/#1085/#1086/#1089,
#991, #1007, enrollment tolerance #1094). 3 commits were already in next by content
(#1060 identical, #1066/#1062 evolved twins — conflicts resolved to next's side).

Per-commit classification and evidence: mosaic-brain fleet/lanes/stack-remediation/main-next-divergence.md.
Conflict resolutions (6 files) itemized in the PR body.

README.md

@@ -74,6 +74,14 @@ The launcher verifies your config, checks for `SOUL.md`, injects your `AGENTS.md
 
 Pi launches default to a token-lean skill posture: `mosaic pi` passes `--no-skills` so Pi does not preload every global skill description into the system prompt. Use `MOSAIC_PI_SKILL_MODE=all mosaic pi` for the legacy all-skills catalog, or `MOSAIC_PI_SKILL_MODE=discover mosaic pi` to let Pi use its native settings/project skill discovery.
 
+Mosaic also loads its Pi extensions from `~/.config/mosaic/runtime/pi/`. Inside Pi,
+`/goal set <statement>` starts a bounded persistent loop that checks every turn and successful
+compaction, requires two evidence-bearing completion reports, and can be inspected or stopped with
+`/goal status`, `/goal pause`, `/goal resume`, and `/goal cancel`. Controller-owned goal-state
+entries redact common credential shapes, but Pi's model/tool-call history is separate, so goals and
+evidence must never contain secrets or raw sensitive output. Mosaic does not install this extension
+into `~/.pi/agent/extensions/`.
+
 ### TUI & Gateway
 
 ```bash