chore(release): v0.26.0 — horizon policy dates every issue, and linear goals (PHNX-4291)

[muqsitnawaz]

Release PR: a version pin with no behavior change of its own. Refs PHNX-4291. This ships #62: the horizon policy in create, plus linear goals.

What changed

• linear: __version__ goes from 0.25.0 to 0.26.0.
• CHANGELOG.md: the Unreleased entries move under ## [0.26.0] - 2026-10-09. That includes --remind-at from feat: --remind-at sets Linear's issue reminder on create and update #61 and everything from feat: horizon policy dates every created issue, and linear goals (PHNX-4291) #62.
• install.sh: VERSION is now v0.26.0, and EXPECTED_SHA256 is the checksum of the bumped linear.
• README.md: both install snippets are pinned to v0.26.0.

Verification

• python3 -m unittest → Ran 267 tests … OK (skipped=4). VersionMatchesChangelogTest passes with 0.26.0.
• sha256sum linear → ca2b69e0cb14ca6b305c20c6d329d86298b7f680fc15c4f4776180581097f64c. That equals the pin in install.sh, and equals the raw file fetched from this branch on GitHub.

After merge: tag v0.26.0 on the merge commit, publish the GitHub release, run install.sh, and check the installed linear --version and linear goals --json.

🤖 Generated with Claude Code

[muqsitnawaz]

Independent review (code-reviewer subagent, non-author): APPROVE. No findings.

• Same shape as the last release: 4 files changed, matching the v0.25.0 release (1712b1f).
• Checksum pin: sha256sum linear equals the EXPECTED_SHA256 at install.sh:11 (ca2b69e0…f64c).
• No stray pins: the only 0.25.0 left is the historical CHANGELOG heading.
• Tests: python3 -m unittest → Ran 267 tests, OK (skipped=4).