Match Amp card to the Mac

[Finesssee]

Summary

Match the Amp card to the Mac (CodexBar 0.70.0):

• The free-tier bar title is "Amp Free" (was "Usage"); the fallback secondary label is "Balance" (was "Monthly").
• No pace line under the Amp Free bar. Pace is kept only for a subscription window (known length and a "renews in ..." reset), as upstream does. The result is marked with_non_authoritative_pace() otherwise.
• No "Status Page" menu row (upstream statusPageURL: nil).
• Legacy subscriptions label their bars "Other usage" / "Orb usage".
• Tier subscriptions get a "Monthly allowances" section: "Agent $18.57" and "Orb 732h" (secondary "a1.small-equivalent hours"; "< 1h" under one hour). The tier bar reset text is the plain "renews in 27 days"; the "· $18.57/$20.00 remaining" suffix moved into those rows.

Root cause

• AmpProvider metadata used generic labels and a status page URL where upstream AmpProviderDescriptor has "Amp Free" / "Balance" and no status page.
• The fetch result always allowed pace; upstream's descriptor pace closure only paces windows with windowMinutes and a "renews in " reset.
• Allowance amounts were appended to the reset text instead of being upstream's "Monthly allowances" rows.

Mac reference

• Sources/CodexBarCore/Providers/Amp/AmpProviderDescriptor.swift: labels, statusPageURL, pace rule, primary/secondary labels.
• Sources/CodexBarCore/Providers/Amp/AmpUsageSnapshot.swift: "Monthly allowances" rows (Agent dollars, Orb whole hours, "< 1h").

Not changed (after card PR 3)

• Credits rows styling (CREDITS caps heading, right-aligned values) is card rendering.
• Pace is a whole-result flag on Windows. A subscriber who also has an Amp Free allowance keeps pace on every lane, so the Amp Free extra lane can still show a pace line that the Mac (per-window rule) would not. Fixing that needs per-lane pace in the shared bridge; the pack does not exercise it.
• The subscription and allowance changes are covered by tests only; the parity pack is free tier, so the capture shows the label, pace and status-page changes.

Tests

• New module mac_parity_tests: metadata_matches_upstream_descriptor, free_tier_has_no_pace, subscription_windows_keep_pace, pace_rule_needs_window_length_and_renewal_text, tier_reports_monthly_allowance_rows, orb_under_one_hour_reads_less_than_one, legacy_subscription_has_no_allowance_rows.
• Updated: the legacy Megawatt test asserts "Other usage" / "Orb usage"; the invalid-tier test expects "renews in 27 days".

Commands

• cargo fmt --all: ok
• cargo test --manifest-path rust/Cargo.toml: pass (3809 passed, 0 failed, 1 ignored)
• cargo clippy --manifest-path rust/Cargo.toml --all-targets -- -D warnings: pass
• cargo test --manifest-path apps/desktop-tauri/src-tauri/Cargo.toml: pass (637 passed)
• cargo clippy --manifest-path apps/desktop-tauri/src-tauri/Cargo.toml --all-targets -- -D warnings: pass
• Frontend files are unchanged, so pnpm test / pnpm run build were not rerun.

Proof

• Before: W:/mac-parity/win-runs/Amp@followups-main/panel.png (main 44d5de3): "Usage 62% left", "25% in reserve · Lasts until reset", "Usage details", "Status Page".
• After: W:/mac-parity/win-runs/Amp@parity-amp/panel.png (this branch f53288c, built with build-proof.sh): "Amp Free 62% left", no pace line or disclosure, no Status Page row.
• Mac: W:/mac-parity/scenarios/providers/Amp/card.png.

Found by the Mac-parity rig (pack Amp).

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📥 Commits

Reviewing files that changed from the base of the PR and between 44d5de3 and f53288c.

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📒 Files selected for processing (3)

• rust/src/providers/amp/display.rs
• rust/src/providers/amp/mod.rs
• rust/src/providers/amp/subscription.rs

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