fix(inbox-send): preserve dots in copied filenames

send_file ran filenames through slugify(), which flattens dots to hyphens. That corrupts the engine.plugin.org plugin-namespace convention: triage-intake.personal-gmail.org arrived as triage-intake-personal-gmail.org, which breaks the engine's triage-intake.*.org glob and the routing that depends on the first dot.

I added slugify_filename() for filename stems. It keeps dots, hyphens, underscores, and case, collapses only whitespace runs to hyphens, and truncates on a separator boundary. The prose --text path still uses slugify().

4 files changed, 110 insertions, 2 deletions

diff --git a/.ai/scripts/inbox-send.py b/.ai/scripts/inbox-send.py
index 8e650ff..5373bd4 100644
--- a/.ai/scripts/inbox-send.py
+++ b/.ai/scripts/inbox-send.py
@@ -110,6 +110,32 @@ def slugify(text: str, max_length: int = MAX_SLUG_LENGTH) -> str:
     return truncated.strip().replace(" ", "-")
 
 
+def slugify_filename(stem: str, max_length: int = MAX_SLUG_LENGTH) -> str:
+    """Slugify a filename stem while preserving its structure.
+
+    Unlike slugify() (for freeform prose), a filename stem is already
+    filename-safe and carries meaning in its separators — dots especially.
+    The engine.plugin.org plugin-namespace convention encodes the
+    engine/plugin boundary in the first dot, so flattening dots to hyphens
+    corrupts the name. Keep [A-Za-z0-9._-] and case (e.g. the TOOLARGE-
+    prefix convention), turn whitespace runs into single hyphens, drop
+    anything else.
+    """
+    stem = re.sub(r"\s+", "-", stem.strip())
+    stem = re.sub(r"[^A-Za-z0-9._-]+", "", stem)
+    stem = re.sub(r"-{2,}", "-", stem).strip("-._")
+    if not stem:
+        return ""
+    if len(stem) <= max_length:
+        return stem
+    truncated = stem[:max_length]
+    # Walk back to the last separator so truncation doesn't cut mid-segment.
+    last_sep = max(truncated.rfind("-"), truncated.rfind("."), truncated.rfind("_"))
+    if last_sep > 0:
+        truncated = truncated[:last_sep]
+    return truncated.strip("-._")
+
+
 def find_target(target_name: str, projects: list[Path]) -> Path | None:
     """Resolve `target_name` against the project list (basename or numeric index)."""
     if target_name.isdigit():
@@ -163,7 +189,7 @@ def send_file(
     """Copy src_path into target_inbox with a dated, source-tagged name."""
     if not src_path.is_file():
         raise FileNotFoundError(f"source file not found: {src_path}")
-    slug = custom_name or slugify(src_path.stem)
+    slug = custom_name or slugify_filename(src_path.stem)
     if not slug:
         raise ValueError(f"could not derive a slug from file: {src_path}")
     ext = src_path.suffix
diff --git a/.ai/scripts/tests/test_inbox_send.py b/.ai/scripts/tests/test_inbox_send.py
index 597a7e9..a0094dc 100644
--- a/.ai/scripts/tests/test_inbox_send.py
+++ b/.ai/scripts/tests/test_inbox_send.py
@@ -248,6 +248,34 @@ class TestInboxSendFile:
         files = list((tmp_path / "projects" / "target" / "inbox").iterdir())
         assert "branching-strategy-notes" in files[0].name
 
+    def test_inbox_send_file_preserves_dots_in_basename(self, project_root, run_script, tmp_path):
+        """Boundary: a dotted stem keeps its dots — the engine.plugin.org plugin namespace must survive transit."""
+        project_root("target")
+        cwd = project_root("source")
+        src = tmp_path / "triage-intake.personal-gmail.org"
+        src.write_text("plugin")
+        run_script(
+            ["target", "--file", str(src)],
+            cwd=cwd, roots=[tmp_path / "projects"],
+        )
+        files = list((tmp_path / "projects" / "target" / "inbox").iterdir())
+        assert len(files) == 1
+        assert _slug_from(files, "source") == "triage-intake.personal-gmail"
+        assert files[0].suffix == ".org"
+
+    def test_inbox_send_file_spaces_become_hyphens(self, project_root, run_script, tmp_path):
+        """Normal: whitespace in a filename stem still collapses to hyphens; dots are what's preserved, not spaces."""
+        project_root("target")
+        cwd = project_root("source")
+        src = tmp_path / "meeting notes draft.org"
+        src.write_text("x")
+        run_script(
+            ["target", "--file", str(src)],
+            cwd=cwd, roots=[tmp_path / "projects"],
+        )
+        files = list((tmp_path / "projects" / "target" / "inbox").iterdir())
+        assert _slug_from(files, "source") == "meeting-notes-draft"
+
     def test_inbox_send_file_name_override(self, project_root, run_script, tmp_path):
         """Normal: --name overrides the basename-derived slug; extension preserved."""
         project_root("target")
diff --git a/claude-templates/.ai/scripts/inbox-send.py b/claude-templates/.ai/scripts/inbox-send.py
index 8e650ff..5373bd4 100644
--- a/claude-templates/.ai/scripts/inbox-send.py
+++ b/claude-templates/.ai/scripts/inbox-send.py
@@ -110,6 +110,32 @@ def slugify(text: str, max_length: int = MAX_SLUG_LENGTH) -> str:
     return truncated.strip().replace(" ", "-")
 
 
+def slugify_filename(stem: str, max_length: int = MAX_SLUG_LENGTH) -> str:
+    """Slugify a filename stem while preserving its structure.
+
+    Unlike slugify() (for freeform prose), a filename stem is already
+    filename-safe and carries meaning in its separators — dots especially.
+    The engine.plugin.org plugin-namespace convention encodes the
+    engine/plugin boundary in the first dot, so flattening dots to hyphens
+    corrupts the name. Keep [A-Za-z0-9._-] and case (e.g. the TOOLARGE-
+    prefix convention), turn whitespace runs into single hyphens, drop
+    anything else.
+    """
+    stem = re.sub(r"\s+", "-", stem.strip())
+    stem = re.sub(r"[^A-Za-z0-9._-]+", "", stem)
+    stem = re.sub(r"-{2,}", "-", stem).strip("-._")
+    if not stem:
+        return ""
+    if len(stem) <= max_length:
+        return stem
+    truncated = stem[:max_length]
+    # Walk back to the last separator so truncation doesn't cut mid-segment.
+    last_sep = max(truncated.rfind("-"), truncated.rfind("."), truncated.rfind("_"))
+    if last_sep > 0:
+        truncated = truncated[:last_sep]
+    return truncated.strip("-._")
+
+
 def find_target(target_name: str, projects: list[Path]) -> Path | None:
     """Resolve `target_name` against the project list (basename or numeric index)."""
     if target_name.isdigit():
@@ -163,7 +189,7 @@ def send_file(
     """Copy src_path into target_inbox with a dated, source-tagged name."""
     if not src_path.is_file():
         raise FileNotFoundError(f"source file not found: {src_path}")
-    slug = custom_name or slugify(src_path.stem)
+    slug = custom_name or slugify_filename(src_path.stem)
     if not slug:
         raise ValueError(f"could not derive a slug from file: {src_path}")
     ext = src_path.suffix
diff --git a/claude-templates/.ai/scripts/tests/test_inbox_send.py b/claude-templates/.ai/scripts/tests/test_inbox_send.py
index 597a7e9..a0094dc 100644
--- a/claude-templates/.ai/scripts/tests/test_inbox_send.py
+++ b/claude-templates/.ai/scripts/tests/test_inbox_send.py
@@ -248,6 +248,34 @@ class TestInboxSendFile:
         files = list((tmp_path / "projects" / "target" / "inbox").iterdir())
         assert "branching-strategy-notes" in files[0].name
 
+    def test_inbox_send_file_preserves_dots_in_basename(self, project_root, run_script, tmp_path):
+        """Boundary: a dotted stem keeps its dots — the engine.plugin.org plugin namespace must survive transit."""
+        project_root("target")
+        cwd = project_root("source")
+        src = tmp_path / "triage-intake.personal-gmail.org"
+        src.write_text("plugin")
+        run_script(
+            ["target", "--file", str(src)],
+            cwd=cwd, roots=[tmp_path / "projects"],
+        )
+        files = list((tmp_path / "projects" / "target" / "inbox").iterdir())
+        assert len(files) == 1
+        assert _slug_from(files, "source") == "triage-intake.personal-gmail"
+        assert files[0].suffix == ".org"
+
+    def test_inbox_send_file_spaces_become_hyphens(self, project_root, run_script, tmp_path):
+        """Normal: whitespace in a filename stem still collapses to hyphens; dots are what's preserved, not spaces."""
+        project_root("target")
+        cwd = project_root("source")
+        src = tmp_path / "meeting notes draft.org"
+        src.write_text("x")
+        run_script(
+            ["target", "--file", str(src)],
+            cwd=cwd, roots=[tmp_path / "projects"],
+        )
+        files = list((tmp_path / "projects" / "target" / "inbox").iterdir())
+        assert _slug_from(files, "source") == "meeting-notes-draft"
+
     def test_inbox_send_file_name_override(self, project_root, run_script, tmp_path):
         """Normal: --name overrides the basename-derived slug; extension preserved."""
         project_root("target")