feat(output): render NetBox object colors with an independent toggle

[thomaschristory]

Summary

Implements #120: render NetBox-native hex colors (role/tag/any color-bearing FK/choice object) in CLI table output and TUI DataTable cells, with a dedicated toggle to disable it independently of --color.

What changed

• Root cause fix — flatten._displayify used to collapse {display|label, color} to just the display string, dropping the hex before any formatter saw it. flatten(..., with_colors=True) now emits a framework-free ColoredValue(text, color) (or a list[ColoredValue] for tags) when an object carries a valid 6-hex color sibling. with_colors=False (the default) returns today's bare strings, so existing callers are untouched.
• New nsc/output/colors.py — ColoredValue dataclass + normalize_hex (strips a leading #, lowercases, rejects non-hex / wrong-length / empty / non-string). Imports nothing from cli/http/rich.
• Table formatter — render(..., object_colors=...) passes with_colors = color and object_colors; _format_cell emits [#rrggbb]escape(text)[/] for ColoredValue and comma-joins colored lists. Inner text is escaped on every path; status-color map remains the fallback for plain strings.
• TUI — build_rows(..., object_colors=...) yields Rich Text(text, style="#rrggbb") cells (comma-joined for tag lists); ListScreen reads self.app.object_colors, threaded from the runtime context.
• Toggle — new Defaults.object_colors: ObjectColorMode (auto/on/off, default auto) + --object-colors/--no-object-colors root flag, resolved by resolve_object_colors(mode, *, color) into RuntimeContext.object_colors. Always gated by the global color/no-color/tty resolution (never ANSI when color is off) but can be disabled independently while status colors stay on.
• JSON/YAML/CSV/JSONL are unchanged — they never request colors, so ColoredValue never reaches them.

Tests

• New tests/output/test_colors.py (normalize_hex / ColoredValue).
• test_flatten.py: with_colors single object, list-of-tags, missing/invalid/empty color fallback, with_colors=False regression guards.
• test_table_color.py: hex markup, escaping, list join, object-colors-off-keeps-status-on, color-gating, dispatch forwarding, non-table CSV unaffected.
• test_runtime_color.py: resolve_object_colors matrix.
• test_models.py: default AUTO + parse on/off.
• test_view.py: styled Text cells + plain-string regression guards.

just lint (ruff + ruff format + mypy --strict) and just test (1183 passed, 1 skipped) both green.

Closes #120

🤖 Generated with Claude Code

[thomaschristory]

Fixed the verified review findings (323b6f4):

• MAJOR (mixed-list raw repr): flatten._displayify now emits a uniform colored list — when any item carries a color, plain strings are promoted to ColoredValue(text, None) so table/TUI formatters (which gate on all(...)) no longer fall through to str(value) and print a raw [ColoredValue(...), 'b'] repr. Now renders 'a, b' with the colored item styled and the uncolored one plain.
• NIT (resolve_object_colors): confirmed ON==AUTO is intentional and documented the contract — ON deliberately defers to the no-color decision so --object-colors / NSC_OBJECT_COLORS=on can never force ANSI under --no-color/NO_COLOR/non-tty; only OFF diverges.

TDD: added failing-first tests in tests/output/test_flatten.py, tests/output/test_table_color.py, and tests/tui/test_view.py covering the mixed-color list at flatten + table + view layers. lint (ruff + mypy --strict) clean; full suite 1188 passed, 1 skipped.