chore: decouple version source path for #320 phase A

[mrlunchbox777]

Summary

• add resources/version.yaml as the primary version source and bump version to 0.1.21
• update release/docs-bump/dependabot workflows and helper scripts to read resources/version.yaml first with legacy fallback to bsctl/static/resources/constants.yaml
• update agent guidance and planning docs to use the new version source path during transition

Validation

• ran ./bsctl/scripts/workflows/docs-bump_docs-bump_version-bump.sh
• ran ./bsctl/scripts/workflows/docs-bump_docs-bump_CHANGELOG-bump.sh

Issue Link

• Refs pivot: decommission bsctl Go CLI and retire CodeQL #320

[mrlunchbox777]

Opened Phase A implementation PR for #320 and synced managed labels.

• Aligned PR title/kind to chore for issue-kind consistency.
• Added managed labels on PR: kind/chore, priority/4, status/doing.
• Synced changes labels on issue pivot: decommission bsctl Go CLI and retire CodeQL #320 with PR scope: changes/documentation, changes/root, changes/meta, changes/resources.
• Kept non-managed issue labels unchanged: track/pivot-migration, area/legacy-basic-setup.

[Copilot]

Pull request overview

Introduces a new root-level version source (resources/version.yaml) to begin decoupling release/docs automation from the bsctl/ tree as part of #320’s phased decommission plan, while keeping a legacy fallback/mirroring path during the transition.

Changes:

• Added resources/version.yaml as the primary version source and bumped version to 0.1.21 (mirroring the legacy constants file).
• Updated release candidate + docs-bump + dependabot autobump automation to read resources/version.yaml first with fallback to bsctl/static/resources/constants.yaml.
• Updated agent guidance and planning documentation to reference the new version source path during the transition.

Reviewed changes

Copilot reviewed 15 out of 15 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
resources/version.yaml	Adds the new primary version source for automation.
bsctl/static/resources/constants.yaml	Mirrors version bump to 0.1.21 for legacy compatibility.
.github/workflows/release.yml	Reads candidate version from resources/version.yaml first, with legacy fallback.
.github/workflows/dependabot-autobump.yaml	Stages resources/version.yaml in Dependabot autobump commits (still includes legacy file).
bsctl/scripts/workflows/docs-bump_docs-bump_version-bump.sh	Docs-bump version divergence check now prefers resources/version.yaml with fallback.
bsctl/scripts/workflows/docs-bump_docs-bump_CHANGELOG-bump.sh	Changelog/version alignment check now prefers resources/version.yaml with fallback.
bsctl/scripts/workflows/dependabot-autobump_bump-version.sh	Bumps version using resources/version.yaml as primary, mirrors legacy constants when present.
bsctl/scripts/workflows/dependabot-autobump_update-changelog.sh	Reads version from new primary source (legacy fallback) when generating Dependabot changelog entries.
CHANGELOG.md	Adds 0.1.21 entry documenting the Phase A cutover and bumps.
AGENTS.md	Updates version bump guidance to point to resources/version.yaml (with mirroring note).
docs/plans/bsctl-codeql-decommission-plan.md	Updates plan inventory to reflect the new version source and transition fallback.
docs/plans/agent-skills-and-release-plan.md	Updates acceptance criteria language for version source path.
.agents/skills/wip-pr-setup/SKILL.md	Updates skill guidance to use new version source path during transition.
.agents/skills/version-bump/SKILL.md	Updates version bump skill to use resources/version.yaml as source of truth (with mirroring).
.agents/skills/update-changelog/SKILL.md	Updates changelog skill inputs/steps to read from new version file first (legacy fallback).

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