feat: add beta label to CLI output

[konstantinoscs]

Adding a resuable "beta feature" component that prints a beta label/warning when a beta feature is used.
Also, using the above mechanism for the Storage product commands ahead of the Preview/Beta launch.

e.g.

Summary by CodeRabbit

• New Features

  • Added beta labeling and one-time notifications for Storage catalog functionality.
  • Storage-related CLI help now clearly identifies beta status and may include documentation links.
  • Beta notices appear only in suitable interactive terminal contexts and are shown once per feature.

• Bug Fixes

  • Prevented duplicate beta notices, including during concurrent CLI usage.

• Tests

  • Added coverage for notice formatting, validation, concurrency, persistence errors, and CLI help output.

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📝 Walkthrough

Walkthrough

Adds atomic filesystem-backed notice claiming in the config crate and introduces Storage beta messaging in catalog command help and runtime operations.

Changes

Storage beta notice

Layer / File(s)	Summary
Atomic notice persistence crates/config/Cargo.toml, crates/config/src/{lib.rs,session.rs}	Adds validated, atomic per-notice claims using sentinel files, with tests for repeated, concurrent, independent, invalid, and failing claims.
Beta notice definition and emission crates/tower-cmd/src/{beta.rs,output.rs,lib.rs}	Defines Storage beta metadata, formats notices, gates emission to interactive normal output, persists claims, and writes first-time notices to stderr.
Catalog command integration crates/tower-cmd/src/catalogs.rs	Adds Storage beta markers to help text and triggers one-time notices for applicable list, credentials, and show operations, with CLI coverage.

Estimated code review effort: 3 (Moderate) | ~30 minutes

Sequence Diagram(s)

sequenceDiagram
  participant CatalogCommand
  participant BetaNotice
  participant ConfigSession
  participant Stderr
  CatalogCommand->>BetaNotice: notify_once(STORAGE)
  BetaNotice->>BetaNotice: check output mode and terminals
  BetaNotice->>ConfigSession: claim_notice("storage")
  ConfigSession-->>BetaNotice: claimed or already claimed
  BetaNotice->>Stderr: write first-time beta notice

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Possibly related PRs

• tower/tower-cli#241: Introduced the catalog command flows that this change extends with Storage beta notifications.

Suggested reviewers: sammuti, jo-sm, socksy

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 20.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: adding beta labeling to CLI output.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/tow-2343-add-beta-label-to-cli

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Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@crates/tower-cmd/src/beta.rs`:
- Around line 28-34: Update the expected string in the
notice_omits_docs_sentence_without_a_url test to include the full
STORAGE.qualification text, including “its API contract and”, while preserving
the existing notice prefix and no-docs-sentence behavior.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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📥 Commits

Reviewing files that changed from the base of the PR and between 8dd7b04 and e04b9d2.

⛔ Files ignored due to path filters (1)

• Cargo.lock is excluded by !**/*.lock

📒 Files selected for processing (7)

• crates/config/Cargo.toml
• crates/config/src/lib.rs
• crates/config/src/session.rs
• crates/tower-cmd/src/beta.rs
• crates/tower-cmd/src/catalogs.rs
• crates/tower-cmd/src/lib.rs
• crates/tower-cmd/src/output.rs