fix: retry init requests and guard JSON parsing

[sadsfae]

Fixes #569

Summary

Two robustness issues in the init/read-only path:

1. --retries never covered init requests. HTTPClient stored self.retries but get_raw performed a single session.get with no retry loop, so transient failures during the initial requests (session discovery, authentication, resource enumeration) failed immediately instead of retrying.

2. json.loads sites lacked ValueError handling. A malformed response surfaced as a raw ValueError traceback instead of a clear BadfishException.

Changes

src/badfish/helpers/http_client.py

• get_raw now wraps the session.get+read in a retry loop honoring self.retries:
  • Retries on transient failures (aiohttp.ClientError, TimeoutError, OSError) with a 1s pause between attempts.
  • Non-retryable: SSL certificate errors stay on the existing _handle_ssl_error path.
  • _continue=True still returns None on failure; final failure raises BadfishException("Failed to communicate with server.").
  • post_request / patch_request / delete_request semantics unchanged.
• Added load_json(raw, context="response") helper that raises BadfishException("Error reading <context> from host.") on ValueError/TypeError.
• Wrapped the unguarded json.loads in find_session_uri.

src/badfish/main.py

• Imported load_json and replaced the unwrapped json.loads(raw.strip()) sites with it (sites already in try/except were left as-is):

Context	Function
boot order	get_boot
reset types	get_reset_types
session	find_session_uri
managers	find_managers_resource (2 sites)
power state	power state retrieval
job status	check_schedule_job_status, check_job_status
firmware inventory	firmware inventory
export job	export job (2 sites)
import job	import job

Test evidence

• tests/test_http_client.py: 39 passed (including new test_get_raw_retries_then_succeeds, test_get_raw_retries_exhausted_raises, test_load_json_valid_returns_parsed, test_load_json_raises_on_invalid_json).
• Targeted main.py-related suites (vendor detection, power, job queue, firmware inventory, SCP, change boot, boot-to, main coverage): all passed.

[codecov]

Codecov Report

❌ Patch coverage is 95.55556% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/badfish/helpers/http_client.py	93.75%	2 Missing ⚠️

Flag	Coverage Δ
unittests	94.84% <95.55%> (-0.04%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/badfish/main.py	93.33% <100.00%> (ø)
src/badfish/helpers/http_client.py	95.95% <93.75%> (-0.77%)	⬇️

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