Release v1.5.0

What changed

• Added provider capability contracts in the registry using tri-state support:
• supported
• unsupported
• unknown
• Added execution safety/diagnostic CLI flags:
• --strict-capabilities
• --dry-run
• --print-effective-config
• Added capability validation before execution:
• default permissive mode: warning + continue
• strict mode: fail-fast on unsupported/unknown requested capabilities
• Added dry-run preflight behavior:
• validates resolved provider/runtime config
• validates capability compatibility
• exits without provider generation and without writing artifacts
• Added effective-config diagnostics with masked API key handling.
• Updated documentation (README + technical docs) to reflect v1.5 safety and preflight behavior.

Why it matters

• Reduces runtime surprises by checking feature compatibility before execution.
• Improves operational safety for CI/automation workflows.
• Adds reproducible preflight diagnostics for debugging configuration issues.
• Preserves the existing stateless execution architecture while improving reliability.

Stability Statement

• v1.5.0 is a stable feature release.
• No CLI breaking changes were introduced.
• No output JSON schema/contract breaking changes were introduced.
• Stateless single-execution design remains unchanged.

Scope Clarification

• This release does not introduce agents, memory, orchestration, tool-calling runtime, or multi-
  turn workflows.
• The tools capability is currently a reserved contract field for future compatibility checks and
  remains unsupported at runtime.

GitHub Pull Requests Included

• feat(v1.5): introduce provider capability contract registry by @damienSavoldelli in #21
• feat(v1.5): add strict and permissive provider capability safety checks by @damienSavoldelli in #22
• feat(v1.5): add dry-run and effective runtime config diagnostics by @damienSavoldelli in #23
• docs(v1.5): document capability safety and diagnostic modes by @damienSavoldelli in #24
• release: prepare v1.5.0 by @damienSavoldelli in #25

Full Changelog: v1.4.0...v1.5.0