[NowinskiK]

Adds project rules to CLAUDE.md, based on what we ran into while working on #404, #435 (#507, #508), #295 and the 1.19.0 release. No code changes.

New sections

• Branches and releases: feature branches from develop and PRs into develop, never straight into master (Fix unit tests for Pester 6 and VS Code host #501 #502 was). Release via develop → master, then move develop to master. Version and ModuleVersion are set at release; feature PRs use [Unreleased].
• Issues and PRs: comment root cause and approach on the issue before coding, create sub-issues for independent problems, Closes #n in PRs.
• Error handling (Az cmdlets): Az cmdlets write non-terminating errors, so always -ErrorAction Stop inside try. Retry only temporary errors with Invoke-AdfWithRetry. Validation belongs in Test-AdfCode. A failed object deployment stops the publish; a failed trigger start/stop is a warning.
• PowerShell strict mode: missing properties and $null.Count throw; if assignments unroll arrays.

Added to existing sections

• Changelog: a behaviour change counts as a functional change (the Unit tests fail with Pester 6 and in VS Code host #501 change had no entry).
• Tests: bug fixes start with a failing test; Az mocks must Write-Error, not throw; run tests under both Stop and Continue; deployment tests cover both publish methods.

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