Release v0.2.9

What's Changed

• Repin the developer-blocking lanes to shared-actions 7cb894fe by @leynos in #408
• Pin the interpreter for the two remaining release scripts by @leynos in #407
• Move the Linux lanes onto the shared compiler-cache arm by @leynos in #409
• Repin the mutation caller past the post-step failure by @leynos in #410
• Republish the rolling release without emptying it by @leynos in #413
• Repin mutation-cargo.yml to shared-actions 2b04a1a by @leynos in #416
• Repin the release lanes and collapse the split constant by @leynos in #415
• Chore(deps): Bump flate2 from 1.1.9 to 1.1.10 by @dependabot[bot] in #420
• Let a caller forbid the silent source build (#413) by @leynos in #414
• Chore(deps): Bump toml from 1.1.4+spec-1.1.0 to 1.1.5+spec-1.1.0 by @dependabot[bot] in #427
• Validate skill manifests in the lint gate by @leynos in #428
• Chore(deps): Bump zstd from 0.13.3 to 0.14.0 by @dependabot[bot] in #431
• Chore(deps): Bump ureq from 3.4.0 to 3.4.1 by @dependabot[bot] in #429
• Chore(deps): Bump rstest from 0.26.1 to 0.27.0 by @dependabot[bot] in #430
• Chore(deps): Bump trybuild from 1.0.120 to 1.0.121 by @dependabot[bot] in #434
• Adopt the estate Markdown formatting baseline by @leynos in #435
• Adopt typos-config-builder gate for spelling by @leynos in #436
• Put the two legs that rebuild everything on runners that remember by @leynos in #438
• Chore(deps): Bump toml from 1.1.5+spec-1.1.0 to 1.1.6+spec-1.1.0 by @dependabot[bot] in #442
• Document excluded_paths for no_std_fs_operations suppression by @leynos in #445
• Drop the deprecated installer-checksum input by @leynos in #446
• Chore(deps): Bump clap from 4.6.6 to 4.6.7 by @dependabot[bot] in #449
• Chore(deps): Bump camino from 1.2.5 to 1.2.6 by @dependabot[bot] in #455
• Leave the coverage publication surface to main (CV-005) by @leynos in #444
• Make the style guide agree with the gates it is written for by @leynos in #453
• Point the Linux compiler cache at Ubicloud's proxy by @leynos in #448
• Cancel superseded pull-request runs in ci.yml by @leynos in #454
• Add a --ref flag for pinned suite installation (#271) by @leynos in #272
• Guard forced rolling rebuild publication by @leynos in #458

Full Changelog: v0.2.8...v0.2.9