fix(docs): merge, not overwrite, COMPONENT lines on identity collision

collect_components() used dict.update(), which let conf.d silently
overwrite functions/ (or vice versa) when the same bare identity
appears in both, e.g. functions/auto-pull.fish and
conf.d/auto-pull.fish. The runtime guard can only ever look up the
bare status current-function/basename string, so both call sites
genuinely share one identity and their raw COMPONENT lines must be
concatenated, not replaced.

docs/generate_component_registry.py

@@ -23,10 +23,23 @@ OUTPUT = REPO / "conf.d" / "__fish_config_op_registry.fish"
 
 
 def collect_components() -> dict[str, list[str]]:
-    """Gather every `# COMPONENT` header across the whole repo."""
-    out = mt.parse_components(REPO / "functions")
-    out.update(mt.parse_components(REPO / "conf.d"))
-    out.update(mt.parse_component_file(REPO / "config.fish"))
+    """Gather every `# COMPONENT` header across the whole repo.
+
+    Concatenates raw component lines when the same identity appears in
+    more than one source (e.g. functions/auto-pull.fish and
+    conf.d/auto-pull.fish both self-identify as "auto-pull" at runtime,
+    since the guard can only ever look up the bare status
+    current-function/basename string) rather than letting one silently
+    overwrite the other.
+    """
+    out: dict[str, list[str]] = {}
+    for source in (
+        mt.parse_components(REPO / "functions"),
+        mt.parse_components(REPO / "conf.d"),
+        mt.parse_component_file(REPO / "config.fish"),
+    ):
+        for identity, lines in source.items():
+            out.setdefault(identity, []).extend(lines)
     return out
 
 

docs/verify-manual.py

@@ -938,6 +938,42 @@ def test_build_registry_keeps_sites_independent():
     assert not warnings
 
 
+def test_collect_components_merges_identity_collisions_across_sources():
+    """functions/auto-pull.fish and conf.d/auto-pull.fish both self-identify
+    as "auto-pull" at runtime -- the guard only ever has the bare
+    status current-function/basename string to look up with -- so
+    collect_components must concatenate their raw COMPONENT lines
+    rather than letting conf.d's entry silently overwrite functions'."""
+    import generate_component_registry as gcr
+
+    with tempfile.TemporaryDirectory() as d:
+        root = Path(d)
+        (root / "functions").mkdir()
+        (root / "conf.d").mkdir()
+        (root / "functions" / "auto-pull.fish").write_text(
+            "# COMPONENT\n"
+            "#   autoexec/sync\n"
+            "function auto-pull\n"
+            "end\n"
+        )
+        (root / "conf.d" / "auto-pull.fish").write_text(
+            "# COMPONENT\n"
+            "#   autoexec/sync\n"
+        )
+        (root / "config.fish").write_text("")
+
+        orig_repo = gcr.REPO
+        try:
+            gcr.REPO = root
+            got = gcr.collect_components()
+        finally:
+            gcr.REPO = orig_repo
+
+    assert got["auto-pull"] == ["autoexec/sync", "autoexec/sync"], (
+        f"both sources' tags should survive the merge, not overwrite: {got}"
+    )
+
+
 def test_render_registry_is_valid_fish_and_round_trips():
     """Sourcing render()'s output must leave the two arrays in the exact
     shape __fish_config_op_registry_lookup expects -- checked via the real