Add webhooks, refresh the official spec, and cover every missing operation

[davidnmbond]

Summary

• Webhooks: endpoint management on IOrganizationsApi (list, create, delete) and a CodacyWebhook helper that verifies the X-Codacy-Signature HMAC-SHA256 and reads quality.analysis.completed payloads.
• Spec: swagger.yaml is now the official specification from api.codacy.com. Two paths that had drifted are fixed (ignoredIssues/search, settings/sync); CleanCacheAsync is marked obsolete because Codacy removed the endpoint; the deprecated repositories query parameter is documented.
• Coverage: every non-deprecated operation in the spec now has a client method (about 170 added, in 23 new modules on ICodacyClient). The one exception is POST .../branches/{branchName}/setDefault, which IRepositoriesApi already covers with a PATCH-based helper.

Test plan

• dotnet build Codacy.Api clean, no warnings
• 76 unit tests pass (including 13 new webhook tests); constructing the client makes Refit validate every route
• The new operations were written from the spec and have not been exercised against the live API

🤖 Generated with Claude Code

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

View in Codacy

🟢 Metrics 12 complexity · 4 duplication

Metric	Results
Complexity	12
Duplication	4

View in Codacy

🟢 Coverage 100.00% diff coverage

Metric	Results
Coverage variation	Report missing for 7f8cce21
Diff coverage	✅ 100.00% diff coverage

View coverage diff in Codacy

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (7f8cce2)	Report Missing	Report Missing	Report Missing
Head commit (fb029a1)	206	135	65.53%

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#49)	44	44	100.00%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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_{TIP This summary will be updated as you push new changes.}