docs(wiki): pi-extension-headless-ritual — source path → pi-extensions repo (#1034)

Legacy .common/lib/pi-extensions removed; source of truth is the repo.

.wiki/concepts/pi-extension-headless-ritual.md

@@ -6,7 +6,7 @@ created: 2026-08-12
 
 # pi-extension headless ritual (agent_end, mode guard, loop-guard)
 
-Durable lessons from building `session-close-ritual` (`.common/lib/pi-extensions/`),
+Durable lessons from building `session-close-ritual` (репо `OpeItcLoc03/pi-extensions`, extensions/),
 the headless injector for the session-handoff closing ritual. All three points
 were live-verified, not docs-read-only.
 
@@ -58,6 +58,6 @@ Cache per-cwd; staleness within a long session is accepted (same as
 
 ## References
 
-- Source: `.common/lib/pi-extensions/session-close-ritual.ts` (+ `.test.mjs`, 12 blocks)
+- Source: `~/projects/pi-extensions/extensions/session-close-ritual.ts` (+ `scripts/session-close-ritual.test.mjs`, 12 blocks)
 - Skill: `session-handoff` v0.5.0 — «Headless (pi)» section
 - pi docs: `extensions.md` — lifecycle diagram, `sendUserMessage` (deliverAs/triggerTurn), mode table