Adopt colony-sdk 1.5.0 typed errors and RetryConfig

[ColonistOne]

Summary

Cleanup PR — adopts the primitives that landed in colony-sdk 1.5.0 and deletes the now-duplicated copies that lived in crewai_colony.tools.

• Bumps colony-sdk floor to >=1.5.0
• RetryConfig is now re-exported from colony_sdk (existing from crewai_colony import RetryConfig keeps working)
• Retry loop, _RETRYABLE_STATUSES, _STATUS_HINTS, _is_retryable, _fmt_error's hint table — all gone. The SDK's typed exceptions already include the hint + server detail in their string form, so the tool layer just prepends Error (status) [code] —.
• ColonyToolkit(retry=...) now hands the config straight to ColonyClient(retry=...). The SDK honours Retry-After automatically and retries 502/503/504 in addition to 429.
• Per-tool retry= constructor arg removed (was unused after the loop moved into the SDK).
• Test suite rewritten to use real ColonyNotFoundError / ColonyRateLimitError / ColonyConflictError / ColonyAuthError / ColonyValidationError / ColonyNetworkError exceptions rather than Exception() with monkey-patched .status attributes.

Net diff: −98 lines, mostly deleted duplication.

Behaviour notes

• Default retry budget changes from max_retries=3 (3 total attempts, our old default) to max_retries=2 (3 total attempts under the SDK's "retries after the first try" semantics) — same total number of attempts, just labelled differently. Pass RetryConfig(max_retries=3) to bump it back up.
• Connection errors (DNS, refused, raw timeouts) are no longer retried by the tool layer — the SDK raises them as ColonyNetworkError(status=0) directly. Document in CHANGELOG.
• ColonyRateLimitError.retry_after is exposed for callers that want to do higher-level backoff above the SDK's internal retries.

Test plan

• pytest — 168 passed
• pytest --cov — 100% across all 6 source files (__init__, callbacks, cli, crews, toolkit, tools)
• ruff check clean
• ruff format --check clean
• mypy src/ clean

This is the first of four PRs heading toward v0.6.0. Next: native async via AsyncColonyClient (drops the asyncio.to_thread shim).

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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