fix(cli): handle unquoted multi-word session names in -c/--continue and -r/--resume

When a user runs `hermes -w -c Pokemon Agent Dev` without quoting the
session name, argparse would fail with:
  error: argument command: invalid choice: 'Agent'

This is because argparse parses `-c Pokemon` (consuming one token via
nargs='?'), then sees 'Agent' and tries to match it as a subcommand.

Fix: add _coalesce_session_name_args() that pre-processes sys.argv before
argparse, joining consecutive non-flag, non-subcommand tokens after -c or
-r into a single argument. This makes both quoted and unquoted multi-word
session names work transparently.

Includes 17 tests covering all edge cases: multi-word names, single-word,
bare flags, flag ordering, subcommand boundaries, and passthrough.

hermes_cli/main.py

@@ -1777,6 +1777,44 @@ def cmd_update(args):
             sys.exit(1)
 
 
+def _coalesce_session_name_args(argv: list) -> list:
+    """Join unquoted multi-word session names after -c/--continue and -r/--resume.
+
+    When a user types ``hermes -c Pokemon Agent Dev`` without quoting the
+    session name, argparse sees three separate tokens.  This function merges
+    them into a single argument so argparse receives
+    ``['-c', 'Pokemon Agent Dev']`` instead.
+
+    Tokens are collected after the flag until we hit another flag (``-*``)
+    or a known top-level subcommand.
+    """
+    _SUBCOMMANDS = {
+        "chat", "model", "gateway", "setup", "whatsapp", "login", "logout",
+        "status", "cron", "doctor", "config", "pairing", "skills", "tools",
+        "sessions", "insights", "version", "update", "uninstall",
+    }
+    _SESSION_FLAGS = {"-c", "--continue", "-r", "--resume"}
+
+    result = []
+    i = 0
+    while i < len(argv):
+        token = argv[i]
+        if token in _SESSION_FLAGS:
+            result.append(token)
+            i += 1
+            # Collect subsequent non-flag, non-subcommand tokens as one name
+            parts: list = []
+            while i < len(argv) and not argv[i].startswith("-") and argv[i] not in _SUBCOMMANDS:
+                parts.append(argv[i])
+                i += 1
+            if parts:
+                result.append(" ".join(parts))
+        else:
+            result.append(token)
+            i += 1
+    return result
+
+
 def main():
     """Main entry point for hermes CLI."""
     parser = argparse.ArgumentParser(
@@ -2356,12 +2394,12 @@ For more help on a command:
                 if not data:
                     print(f"Session '{args.session_id}' not found.")
                     return
-                with open(args.output, "w") as f:
+                with open(args.output, "w", encoding="utf-8") as f:
                     f.write(_json.dumps(data, ensure_ascii=False) + "\n")
                 print(f"Exported 1 session to {args.output}")
             else:
                 sessions = db.export_all(source=args.source)
-                with open(args.output, "w") as f:
+                with open(args.output, "w", encoding="utf-8") as f:
                     for s in sessions:
                         f.write(_json.dumps(s, ensure_ascii=False) + "\n")
                 print(f"Exported {len(sessions)} sessions to {args.output}")
@@ -2515,7 +2553,11 @@ For more help on a command:
     # =========================================================================
     # Parse and execute
     # =========================================================================
-    args = parser.parse_args()
+    # Pre-process argv so unquoted multi-word session names after -c / -r
+    # are merged into a single token before argparse sees them.
+    # e.g. ``hermes -c Pokemon Agent Dev`` → ``hermes -c 'Pokemon Agent Dev'``
+    _processed_argv = _coalesce_session_name_args(sys.argv[1:])
+    args = parser.parse_args(_processed_argv)
     
     # Handle --version flag
     if args.version:

tests/hermes_cli/test_coalesce_session_args.py

@@ -0,0 +1,113 @@
+"""Tests for _coalesce_session_name_args — multi-word session name merging."""
+
+import pytest
+from hermes_cli.main import _coalesce_session_name_args
+
+
+class TestCoalesceSessionNameArgs:
+    """Ensure unquoted multi-word session names are merged into one token."""
+
+    # ── -c / --continue ──────────────────────────────────────────────────
+
+    def test_continue_multiword_unquoted(self):
+        """hermes -c Pokemon Agent Dev → -c 'Pokemon Agent Dev'"""
+        assert _coalesce_session_name_args(
+            ["-c", "Pokemon", "Agent", "Dev"]
+        ) == ["-c", "Pokemon Agent Dev"]
+
+    def test_continue_long_form_multiword(self):
+        """hermes --continue Pokemon Agent Dev"""
+        assert _coalesce_session_name_args(
+            ["--continue", "Pokemon", "Agent", "Dev"]
+        ) == ["--continue", "Pokemon Agent Dev"]
+
+    def test_continue_single_word(self):
+        """hermes -c MyProject (no merging needed)"""
+        assert _coalesce_session_name_args(["-c", "MyProject"]) == [
+            "-c",
+            "MyProject",
+        ]
+
+    def test_continue_already_quoted(self):
+        """hermes -c 'Pokemon Agent Dev' (shell already merged)"""
+        assert _coalesce_session_name_args(
+            ["-c", "Pokemon Agent Dev"]
+        ) == ["-c", "Pokemon Agent Dev"]
+
+    def test_continue_bare_flag(self):
+        """hermes -c (no name — means 'continue latest')"""
+        assert _coalesce_session_name_args(["-c"]) == ["-c"]
+
+    def test_continue_followed_by_flag(self):
+        """hermes -c -w (no name consumed, -w stays separate)"""
+        assert _coalesce_session_name_args(["-c", "-w"]) == ["-c", "-w"]
+
+    def test_continue_multiword_then_flag(self):
+        """hermes -c my project -w"""
+        assert _coalesce_session_name_args(
+            ["-c", "my", "project", "-w"]
+        ) == ["-c", "my project", "-w"]
+
+    def test_continue_multiword_then_subcommand(self):
+        """hermes -c my project chat -q hello"""
+        assert _coalesce_session_name_args(
+            ["-c", "my", "project", "chat", "-q", "hello"]
+        ) == ["-c", "my project", "chat", "-q", "hello"]
+
+    # ── -r / --resume ────────────────────────────────────────────────────
+
+    def test_resume_multiword(self):
+        """hermes -r My Session Name"""
+        assert _coalesce_session_name_args(
+            ["-r", "My", "Session", "Name"]
+        ) == ["-r", "My Session Name"]
+
+    def test_resume_long_form_multiword(self):
+        """hermes --resume My Session Name"""
+        assert _coalesce_session_name_args(
+            ["--resume", "My", "Session", "Name"]
+        ) == ["--resume", "My Session Name"]
+
+    def test_resume_multiword_then_flag(self):
+        """hermes -r My Session -w"""
+        assert _coalesce_session_name_args(
+            ["-r", "My", "Session", "-w"]
+        ) == ["-r", "My Session", "-w"]
+
+    # ── combined flags ───────────────────────────────────────────────────
+
+    def test_worktree_and_continue_multiword(self):
+        """hermes -w -c Pokemon Agent Dev (the original failing case)"""
+        assert _coalesce_session_name_args(
+            ["-w", "-c", "Pokemon", "Agent", "Dev"]
+        ) == ["-w", "-c", "Pokemon Agent Dev"]
+
+    def test_continue_multiword_and_worktree(self):
+        """hermes -c Pokemon Agent Dev -w (order reversed)"""
+        assert _coalesce_session_name_args(
+            ["-c", "Pokemon", "Agent", "Dev", "-w"]
+        ) == ["-c", "Pokemon Agent Dev", "-w"]
+
+    # ── passthrough (no session flags) ───────────────────────────────────
+
+    def test_no_session_flags_passthrough(self):
+        """hermes -w chat -q hello (nothing to merge)"""
+        result = _coalesce_session_name_args(["-w", "chat", "-q", "hello"])
+        assert result == ["-w", "chat", "-q", "hello"]
+
+    def test_empty_argv(self):
+        assert _coalesce_session_name_args([]) == []
+
+    # ── subcommand boundary ──────────────────────────────────────────────
+
+    def test_stops_at_sessions_subcommand(self):
+        """hermes -c my project sessions list → stops before 'sessions'"""
+        assert _coalesce_session_name_args(
+            ["-c", "my", "project", "sessions", "list"]
+        ) == ["-c", "my project", "sessions", "list"]
+
+    def test_stops_at_setup_subcommand(self):
+        """hermes -c my setup → 'setup' is a subcommand, not part of name"""
+        assert _coalesce_session_name_args(
+            ["-c", "my", "setup"]
+        ) == ["-c", "my", "setup"]