Resolve remaining source-of-truth inconsistencies and add CI consistency checks

[armandocodecr]

Closes #5

Most of the issue's checkboxes were already resolved by #2, #3, and #4. This PR sweeps the whole repo for what remained and adds automated guardrails:

• SKILL.md — install command and skills.sh link now use the canonical trustless-work/trustlesswork-skill naming.
• skills/api/core-concepts.md — the transaction-flow example mixed networks (mainnet base URL + WalletNetwork.TESTNET); now consistently testnet with a mainnet comment.
• skills/api/multi-release-escrow.md — complete-milestone was the last interface documenting milestoneIndex as number; now string like every other endpoint.
• skills/api/types.md — approverFunds / receiverFunds on the indexer response marked @deprecated (legacy two-party resolution model, superseded by distributions: { address, amount }[]).
• skills/api/trustlines.md — the 0.5 XLM reserve is now described as a current Stellar network parameter, not a Trustless Work constant.
• scripts/check-consistency.sh + CI workflow — 8 grep-based checks that fail the build if known regressions reappear: quoted numeric amounts, stale Authorization: Bearer, old repo names, numeric milestoneIndex (examples and API interfaces), deprecated stellar-sdk imports, tuple-style distributions, fee-as-funding-amount guidance, and claims that reads skip the API key. All checks pass on this branch.

Verified clean sweeps (no remaining hits) for the checkboxes closed by earlier PRs: API-key requirement on all endpoints, key security model, fees-at-release, lifecycle tagging, Bearer removal, resolve-dispute payload shape, trustline address scope, contract-verified role permissions, and the source-of-truth hierarchy.

[coderabbitai]

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[techrebelgit]

Approved to merge. We identified a few follow-up consistency gaps (Blocks API-key wording, tuple-style distributions example, stronger grep coverage, and clearer legacy indexer deprecation wording), but these can be addressed immediately after merge as follow-up fixes.