feat(skills): add design-md skill for Google's DESIGN.md spec (#14876)

* feat(config): make tool output truncation limits configurable

Port from anomalyco/opencode#23770: expose a new `tool_output` config
section so users can tune the hardcoded truncation caps that apply to
terminal output and read_file pagination.

Three knobs under `tool_output`:
- max_bytes (default 50_000) — terminal stdout/stderr cap
- max_lines (default 2000) — read_file pagination cap
- max_line_length (default 2000) — per-line cap in line-numbered view

All three keep their existing hardcoded values as defaults, so behaviour
is unchanged when the section is absent. Power users on big-context
models can raise them; small-context local models can lower them.

Implementation:
- New `tools/tool_output_limits.py` reads the section with defensive
  fallback (missing/invalid values → defaults, never raises).
- `tools/terminal_tool.py` MAX_OUTPUT_CHARS now comes from
  get_max_bytes().
- `tools/file_operations.py` normalize_read_pagination() and
  _add_line_numbers() now pull the limits at call time.
- `hermes_cli/config.py` DEFAULT_CONFIG gains the `tool_output` section
  so `hermes setup` writes defaults into fresh configs.
- Docs page `user-guide/configuration.md` gains a "Tool Output
  Truncation Limits" section with large-context and small-context
  example configs.

Tests (18 new in tests/tools/test_tool_output_limits.py):
- Default resolution with missing / malformed / non-dict config.
- Full and partial user overrides.
- Coercion of bad values (None, negative, wrong type, str int).
- Shortcut accessors delegate correctly.
- DEFAULT_CONFIG exposes the section with the right defaults.
- Integration: normalize_read_pagination clamps to the configured
  max_lines.

* feat(skills): add design-md skill for Google's DESIGN.md spec

Built-in skill under skills/creative/ that teaches the agent to author,
lint, diff, and export DESIGN.md files — Google's open-source
(Apache-2.0) format for describing a visual identity to coding agents.

Covers:
- YAML front matter + markdown body anatomy
- Full token schema (colors, typography, rounded, spacing, components)
- Canonical section order + duplicate-heading rejection
- Component property whitelist + variants-as-siblings pattern
- CLI workflow via 'npx @google/design.md' (lint/diff/export/spec)
- Lint rule reference including WCAG contrast checks
- Common YAML pitfalls (quoted hex, negative dimensions, dotted refs)
- Starter template at templates/starter.md

Package verified live on npm (@google/design.md@0.1.1).

tools/file_operations.py

@@ -292,10 +292,15 @@ def normalize_read_pagination(offset: Any = DEFAULT_READ_OFFSET,
     Tool schemas declare minimum/maximum values, but not every caller or
     provider enforces schemas before dispatch. Clamp here so invalid values
     cannot leak into sed ranges like ``0,-1p``.
+
+    The upper bound on ``limit`` comes from ``tool_output.max_lines`` in
+    config.yaml (defaults to the module-level ``MAX_LINES`` constant).
     """
+    from tools.tool_output_limits import get_max_lines
+    max_lines = get_max_lines()
     normalized_offset = max(1, _coerce_int(offset, DEFAULT_READ_OFFSET))
     normalized_limit = _coerce_int(limit, DEFAULT_READ_LIMIT)
-    normalized_limit = max(1, min(normalized_limit, MAX_LINES))
+    normalized_limit = max(1, min(normalized_limit, max_lines))
     return normalized_offset, normalized_limit
 
 
@@ -414,12 +419,14 @@ class ShellFileOperations(FileOperations):
     
     def _add_line_numbers(self, content: str, start_line: int = 1) -> str:
         """Add line numbers to content in LINE_NUM|CONTENT format."""
+        from tools.tool_output_limits import get_max_line_length
+        max_line_length = get_max_line_length()
         lines = content.split('\n')
         numbered = []
         for i, line in enumerate(lines, start=start_line):
             # Truncate long lines
-            if len(line) > MAX_LINE_LENGTH:
-                line = line[:MAX_LINE_LENGTH] + "... [truncated]"
+            if len(line) > max_line_length:
+                line = line[:max_line_length] + "... [truncated]"
             numbered.append(f"{i:6d}|{line}")
         return '\n'.join(numbered)