Fixes #44199

Problem

The /resume inline list (HermesCLI._show_recent_sessions, cli.py) and the hermes sessions list table (cmd_sessions, hermes_cli/main.py) pad cells with str.format width specs ({var:<32}) and truncate with str slices ([:38]). Both count characters, but CJK characters occupy two terminal columns, so any title or preview containing them shifts every column to its right:

  #   Title                            Preview                                  Last Active   ID
  ─── ──────────────────────────────── ──────────────────────────────────────── ───────────── ────────────────────────
  2   整理论文和更新README #4                 我更新了paper/和 …   6d ago        20260604_195221_254cc9

Fix

Rather than switching these renderers to rich.table.Table, this adds three small display-width helpers to hermes_cli/main.py — _disp_width / _clip_to_width / _pad_to_width — using the same wcwidth-based approach (including the clamp-negative-to-zero convention) that agent/markdown_tables.py already uses for exactly this problem. Both renderers now truncate and pad by terminal columns. _clip_to_width never splits a double-width character across the column boundary.

This keeps the diff minimal and the output byte-identical for pure-ASCII rows, so nothing depending on the current format changes. wcwidth is already imported unconditionally by agent/markdown_tables.py and is guaranteed present transitively via the pinned prompt_toolkit.

After:

  #   Title                            Preview                                  Last Active   ID
  ─── ──────────────────────────────── ──────────────────────────────────────── ───────────── ────────────────────────
  1   整理论文和更新README #4          我更新了paper/和 README，整理了所有章    6d ago        20260604_195221_254cc9
  2   Refactor session storage         moved sqlite schema into hermes_state    ?             20260603_101512_aa11bb

Notes on scope

• Titles in the /resume table are padded but deliberately not clipped: /resume fails on title match because display truncates titles to 30 chars #14082 made long titles render in full there (enforced by test_resume_list_shows_full_long_titles), so an over-long title still trades alignment for visibility, exactly as on main. Only the preview is clipped — now by columns instead of characters.
• cmd_sessions keeps its existing [:30] title truncation semantics, just measured in columns.
• The issue's suggestion to move Last Active/ID to the left is a layout change beyond the alignment bug, so it's left out of this fix.

Tests

• tests/hermes_cli/test_session_table_width.py (new): unit coverage for the three helpers — CJK widths, never splitting a double-width char at the boundary, negative-wcswidth clamping, ASCII equivalence with str.ljust.
• tests/cli/test_cli_resume_command.py: new test asserting the ID column starts at the same display column for a CJK row and an ASCII row.
• Full tests/cli/ suite passes (the one failure, test_resume_quiet_stderr.py::test_session_not_found_goes_to_stdout_in_full_mode, is a pre-existing test-ordering flake that fails identically on pristine origin/main when the whole directory runs together, and passes in isolation both there and on this branch).

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