chore: remove all 'fake-pi-agent' references — code, linter, docs

- naming-decisions.md: rephrase row, no longer references old filename
- wiki-lint: remove allowlist entry + guard block (rename is done)
- Verified: zero 'fake' references remaining in repo

docs/wiki/naming-decisions.md

@@ -31,7 +31,7 @@ harness only.
 | `COLIBRI_AUTOSPAWN_PI` → `COLIBRI_AUTOSPAWN`     | Harness-neutral (default agent is zot, not pi)                                    | `crates/colibri-daemon/src/socket.rs`          |
 | `COLIBRI_PI_BINARY` → `COLIBRI_AUTOSPAWN_BINARY` | same                                                                              | `socket.rs` (`autospawn_agent_if_configured`)  |
 | `pi_session_id` → `session_id`                   | zot agents have session ids too; `#[serde(alias)]` keeps back-compat              | `crates/colibri-glasspane/src/lib.rs` (`Pane`) |
-| `fake-pi-agent.py` → `sample-pi-agent.py`        | "fake" too loaded; it emits a canned _sample_                                     | `scripts/sample-pi-agent.py`                   |
+| `sample-pi-agent.py`                            | Renamed from legacy test-agent filename; emits a canned _sample_                            | `scripts/sample-pi-agent.py`                   |
 | non-local spawn default `hermes-agent` → `zot`   | `hermes-agent` was a nonexistent leftover binary                                  | `socket.rs` (`default_agent_args`)             |
 | `usb_nodes` → `hive_nodes`                       | a node is any host that joined the hive, not only a USB boot (`+node_type`); #161 | `packaging/mother/mother_schema.sql`           |
 | `pi_type` → `event_type`                         | internal name for the normalized event type; harness-neutral (not serialized)     | `crates/colibri-glasspane/src/lib.rs`          |

scripts/wiki-lint

@@ -49,7 +49,6 @@ for wiki_file in "$WIKI_DIR"/*.md; do
         case "$path_ref" in
             ""|index*|agent-harness*|naming-decisions*|quality-gates*) continue ;;
             path/to/*|clawdie-iso/*) continue ;;
-            fake-pi-agent.py) continue ;;            # old name in the Shipped table
             stage-colibri-iso.sh) continue ;;        # cross-repo (clawdie-iso)
             ADR-agent-harness-consolidation.md) continue ;;  # wiki-documented as absent
             *.md|*.rs|*.sh|*.py|*.sql|*.json|*.toml|*.yml|*.cfg|*.env|*.txt) ;;
@@ -157,13 +156,6 @@ while IFS= read -r old_name; do
     fi
 done < "$OLD_NAMES_FILE"
 
-# The renamed sample agent must not reappear under its old filename.
-if [ -f "$REPO_ROOT/scripts/fake-pi-agent.py" ]; then
-    fail "scripts/fake-pi-agent.py still exists (renamed to sample-pi-agent.py)"
-else
-    pass
-fi
-
 echo ""
 
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