Fix --file/--body aliasing in pc vector upsert

[austin-denoble]

Problem

@bradumbaugh reported an issue with the aliasing in the pc vector upsert command. --file and --body flags are meant to be aliases, but --file is configured as required making --body unusable due to cobra error'ing when --file is not passed.

Solution

Make sure --file is not configured as a required flag to vector upsert since --body is an alias, add custom validation / error handling for the empty file/body case.

Additionally, I cleaned up a .cache folder that was incorrectly committed to source previously, along with removing the claude-code-review workflows from the repo. We've been using cursorbot generally, and I'll get this repo setup with that in a follow-up PR.

Before

./dist/pc_darwin_arm64_v8.0/pc index vector upsert --index-name test-cps --body /Users/austin/workspace/go-pinecone-consumer/dense_dim_3_x4.json
Error: required flag(s) "file" not set
Usage:
  pc index vector upsert [flags]

Examples:
  $ pc index vector upsert --index-name my-index --namespace my-namespace --body ./vectors.json
  $ pc index vector upsert --index-name my-index --namespace my-namespace --body ./vectors.jsonl
  $ cat payload.json | pc index vector upsert --index-name my-index --namespace my-namespace --body -

Flags:
  -b, --batch-size int      size of batches to upsert (default: 500) (default 500)
      --body string         alias for --file
      --file string         request body JSON or JSONL (inline, ./path.json[l], or '-' for stdin; only one argument may use stdin)
  -h, --help                help for upsert
  -n, --index-name string   name of index to upsert into
  -j, --json                output as JSON
      --namespace string    namespace to upsert into (default "__default__")

Global Flags:
  -q, --quiet              suppress output
      --timeout duration   timeout for commands, defaults to 60s (0 to disable) (default 1m0s)

###After

./dist/pc_darwin_arm64_v8.0/pc index vector upsert --index-name test-cps --body /Users/austin/workspace/go-pinecone-consumer/dense_dim_3_x4.json
[SUCCESS] Upserted 4 vectors into namespace __default__ (batch 1 of 1)

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
• Infrastructure change (CI configs, etc)
• Non-code change (docs, etc)
• None of the above: (explain here)

Test Plan

Test corrected flow by calling pc index vector upsert --index-name my-index --body my-file.json and observe no errors.

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[claude]

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