chore: release v0.15.4

[edwin-zvs]

Bump version to 0.15.4 for patch release.

Changes since v0.15.3:

• feat(claude): adapt inferred context windows (Adapt inferred Claude context windows #941)
• fix(daemon): settle a Run fork's dispatched shimmer when the fork closes (fix(daemon): settle a Run fork's dispatched shimmer when the fork closes #940)
• feat(tui): full/compact view modes for the session list (feat(tui): full/compact view modes for the session list #939)
• tui: switch session-list collapse/expand glyphs to «/» (tui: switch session-list collapse/expand glyphs to «/» #938)
• feat(claude): infer context windows from model (Infer Claude context windows from transcript and model #937)
• fix(tui): improve empty context gauge contrast (Improve empty context gauge text contrast #936)
• feat(daemon): Run forks self-archive when their dispatched task completes (feat(daemon): Run forks self-archive when their dispatched task completes #935)
• feat(daemon): annotate selection with fork's session clip on fork Runs (feat(daemon): annotate selection with fork's session clip on fork Runs #934)