refactor(fleet): consolidate palette + is_live, drop renderer-polish

[NagyVikt]

Summary

Operator review flagged three drift sources where per-binary code disagreed with the canonical fleet-ui / fleet-data layer. Compound PR because all three patches touch the same per-binary ios_page_design.rs files.

• (a) Palette migration — fleet-watcher and fleet-waves were declaring their own iOS-named accent constants. Migrated them to fleet_ui::palette::* and locked the canonical hexes with hex-parity tests.
• (b) Renderer-polish deletion — rust/fleet-renderer-polish/ was library-only, unadopted, and a third copy of those same colors (drift source). Deleted entirely.
• (c) is_live unification — Added WorkerRow::is_capped() to fleet-data so dashboards can't disagree with the data layer on the "capped" tally.

Drift resolution table

The two per-binary modules used iOS Light-mode system colors; the dashboards render on a dark TUI surface so the palette's iOS Dark-mode variants are correct. Palette wins every contest.

Binary	Old constant (hex)	Canonical from palette::* (hex)	Source
fleet-watcher	IOS_BLUE #007aff	IOS_TINT #0a84ff	Apple .systemBlue (Dark)
fleet-watcher	IOS_GREEN #34c759	IOS_GREEN #30d158	Apple .systemGreen (Dark)
fleet-watcher	IOS_RED #ff3b30	IOS_DESTRUCTIVE #ff453a	Apple .systemRed (Dark)
fleet-watcher	IOS_ORANGE #ff9500	IOS_ORANGE #ff9f0a	Apple .systemOrange (Dark)
fleet-waves	ACCENT #007aff	IOS_TINT #0a84ff	Apple .systemBlue (Dark)
fleet-waves	SUCCESS #34c759	IOS_GREEN #30d158	Apple .systemGreen (Dark)
fleet-waves	DANGER #ff3b30	IOS_DESTRUCTIVE #ff453a	Apple .systemRed (Dark)
fleet-waves	WARNING #ff9500	IOS_ORANGE #ff9f0a	Apple .systemOrange (Dark)

Each binary keeps its local surface tones (BG, SURFACE, *_SOFT, etc.) because the mock pages intentionally use a deeper-than-IOS_BG_SOLID ramp to read as distinct visual contexts; only the iOS-named accent palette was drifting.

is_capped contract

/// `true` when this row counts toward the "capped" tally on dashboards.
/// Two independent signals can flip a row to capped:
///   1. agent-auth list reports 5h >= 100%
///   2. The pane scrollback classifier returned PaneState::Capped
pub fn is_capped(&self) -> bool {
    self.five_h_pct >= 100 || matches!(self.state, Some(PaneState::Capped))
}

Migrated fleet-state::Summary::from_rows to call row.is_capped() instead of recomputing inline. is_live already lived on WorkerRow; this just adds the partner predicate so dashboards can't disagree.

Files deleted

• rust/fleet-renderer-polish/Cargo.toml
• rust/fleet-renderer-polish/src/lib.rs

The workspace fleet-* glob in rust/Cargo.toml drops it automatically — no manifest edit needed. Verified no other workspace crate referenced fleet-renderer-polish / fleet_renderer_polish before deletion.

Per-binary line-count delta

Modest because most lines came from local surface tones (kept) and the new code is mostly hex-parity tests + the is_capped docstring:

 rust/fleet-data/src/fleet.rs              | 17 ++++++++++           (+17)
 rust/fleet-state/src/ios_page_design.rs   |  5 +--                  (+2 / -3)
 rust/fleet-ui/src/palette.rs              | 53 +++++++++++++++++++  (+53)
 rust/fleet-watcher/src/ios_page_design.rs | 14 +++++---             (+10 / -4)
 rust/fleet-waves/src/ios_page_design.rs   | 11 ++++---              (+7 / -4)

Plus -155 from fleet-renderer-polish removal.

Test plan

• cargo check --workspace clean
• cargo test -p fleet-ui --lib — 39 tests pass, palette hex-parity guard (extended) green
• cargo test --workspace --exclude fleet-ui — all green; fleet-state, fleet-waves, fleet-watcher snapshot tests pass unchanged (TestBackend output is text-only so accent migration does not perturb fixtures)
• Operator eyeball — the watcher and waves mock pages will now render with #0a84ff / #30d158 / #ff453a / #ff9f0a instead of #007aff / #34c759 / #ff3b30 / #ff9500. Visually this is a slight shift toward the brighter Dark-mode iOS palette already used by fleet-state and the rest of the dashboard. Worth confirming on the live boards.

Notes

• A pre-existing test-only compile error in rust/fleet-ui/tests/tab_strip_snapshot.rs references the removed fleet_ui::tab_strip module path (left over from PR refactor(fleet-ui): split tab_strip into mod/layout/render and extract render_pill #156's mod-folder split). Untouched by this PR; surfaces only with cargo test -p fleet-ui including integration tests.